619 lines
22 KiB
Python
619 lines
22 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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from oslo_config import cfg
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from oslo_log import log as logging
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import six
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from heat.common import exception
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from heat.common.i18n import _
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from heat.common.i18n import _LI
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from heat.common import template_format
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from heat.engine import attributes
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from heat.engine import constraints
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from heat.engine import properties
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from heat.engine.resources import stack_resource
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LOG = logging.getLogger(__name__)
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lb_template_default = r'''
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{
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"AWSTemplateFormatVersion": "2010-09-09",
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"Description": "Built in HAProxy server using Fedora 21 x64 cloud image",
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"Parameters" : {
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"KeyName" : {
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"Type" : "String"
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}
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},
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"Resources": {
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"latency_watcher": {
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"Type": "AWS::CloudWatch::Alarm",
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"Properties": {
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"MetricName": "Latency",
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"Namespace": "AWS/ELB",
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"Statistic": "Average",
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"Period": "60",
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"EvaluationPeriods": "1",
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"Threshold": "2",
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"AlarmActions": [],
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"ComparisonOperator": "GreaterThanThreshold"
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}
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},
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"CfnLBUser" : {
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"Type" : "AWS::IAM::User"
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},
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"CfnLBAccessKey" : {
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"Type" : "AWS::IAM::AccessKey",
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"Properties" : {
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"UserName" : {"Ref": "CfnLBUser"}
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}
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},
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"LB_instance": {
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"Type": "AWS::EC2::Instance",
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"Metadata": {
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"AWS::CloudFormation::Init": {
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"config": {
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"packages": {
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"yum": {
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"haproxy" : [],
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"socat" : []
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}
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},
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"services": {
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"systemd": {
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"crond" : { "enabled" : "true", "ensureRunning" : "true" }
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}
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},
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"files": {
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"/etc/cfn/cfn-credentials" : {
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"content" : { "Fn::Join" : ["", [
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"AWSAccessKeyId=", { "Ref" : "CfnLBAccessKey" }, "\n",
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"AWSSecretKey=", {"Fn::GetAtt": ["CfnLBAccessKey",
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"SecretAccessKey"]}, "\n"
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]]},
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"mode" : "000400",
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"owner" : "root",
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"group" : "root"
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},
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"/etc/cfn/cfn-hup.conf" : {
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"content" : { "Fn::Join" : ["", [
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"[main]\n",
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"stack=", { "Ref" : "AWS::StackId" }, "\n",
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"credential-file=/etc/cfn/cfn-credentials\n",
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"region=", { "Ref" : "AWS::Region" }, "\n",
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"interval=60\n"
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]]},
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"mode" : "000400",
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"owner" : "root",
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"group" : "root"
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},
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"/etc/cfn/hooks.conf" : {
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"content": { "Fn::Join" : ["", [
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"[cfn-init]\n",
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"triggers=post.update\n",
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"path=Resources.LB_instance.Metadata\n",
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"action=/opt/aws/bin/cfn-init -s ",
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{ "Ref": "AWS::StackId" },
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" -r LB_instance ",
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" --region ", { "Ref": "AWS::Region" }, "\n",
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"runas=root\n",
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"\n",
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"[reload]\n",
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"triggers=post.update\n",
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"path=Resources.LB_instance.Metadata\n",
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"action=systemctl reload-or-restart haproxy.service\n",
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"runas=root\n"
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]]},
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"mode" : "000400",
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"owner" : "root",
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"group" : "root"
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},
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"/etc/haproxy/haproxy.cfg": {
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"content": "",
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"mode": "000644",
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"owner": "root",
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"group": "root"
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},
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"/root/haproxy_tmp.te": {
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"mode": "000600",
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"owner": "root",
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"group": "root",
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"content": { "Fn::Join" : [ "", [
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"module haproxy_tmp 1.0;\n",
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"require { type tmp_t; type haproxy_t;",
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"class sock_file { rename write create unlink link };",
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"class dir { write remove_name add_name };}\n",
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"allow haproxy_t ",
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"tmp_t:dir { write remove_name add_name };\n",
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"allow haproxy_t ",
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"tmp_t:sock_file { rename write create unlink link};\n"
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]]}
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},
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"/tmp/cfn-hup-crontab.txt" : {
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"content" : { "Fn::Join" : ["", [
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"MAIL=\"\"\n",
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"\n",
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"* * * * * /opt/aws/bin/cfn-hup -f\n",
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"* * * * * /opt/aws/bin/cfn-push-stats ",
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" --watch ", { "Ref" : "latency_watcher" }, " --haproxy\n"
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]]},
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"mode" : "000600",
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"owner" : "root",
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"group" : "root"
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}
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}
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}
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}
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},
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"Properties": {
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"ImageId": "Fedora-Cloud-Base-20141203-21.x86_64",
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"InstanceType": "m1.small",
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"KeyName": { "Ref": "KeyName" },
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"UserData": { "Fn::Base64": { "Fn::Join": ["", [
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"#!/bin/bash -v\n",
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"# Helper function\n",
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"function error_exit\n",
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"{\n",
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" /opt/aws/bin/cfn-signal -e 1 -r \"$1\" '",
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{ "Ref" : "WaitHandle" }, "'\n",
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" exit 1\n",
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"}\n",
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"/opt/aws/bin/cfn-init -s ",
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{ "Ref": "AWS::StackId" },
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" -r LB_instance ",
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" --region ", { "Ref": "AWS::Region" }, "\n",
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"# HAProxy+SELinux, https://www.mankier.com/8/haproxy_selinux \n",
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"# this is exported by selinux-policy >=3.12.1.196\n",
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"setsebool haproxy_connect_any 1\n",
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"# when the location of haproxy stats file is fixed\n",
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"# in heat-cfntools and AWS::ElasticLoadBalancing::LoadBalancer\n",
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"# to point to /var/lib/haproxy/stats, \n",
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"# this next block can be removed.\n",
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"# compile custom module to allow /tmp files and sockets access\n",
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"cd /root\n",
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"checkmodule -M -m -o haproxy_tmp.mod haproxy_tmp.te\n",
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"semodule_package -o haproxy_tmp.pp -m haproxy_tmp.mod\n",
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"semodule -i haproxy_tmp.pp\n",
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"touch /tmp/.haproxy-stats\n",
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"semanage fcontext -a -t haproxy_tmpfs_t /tmp/.haproxy-stats\n",
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"restorecon -R -v /tmp/.haproxy-stats\n",
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"# install cfn-hup crontab\n",
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"crontab /tmp/cfn-hup-crontab.txt\n",
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"# restart haproxy service to catch initial changes\n",
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"systemctl reload-or-restart haproxy.service\n",
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"# LB setup completed, signal success\n",
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"/opt/aws/bin/cfn-signal -e 0 -r \"LB server setup complete\" '",
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{ "Ref" : "WaitHandle" }, "'\n"
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]]}}
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}
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},
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"WaitHandle" : {
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"Type" : "AWS::CloudFormation::WaitConditionHandle"
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},
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"WaitCondition" : {
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"Type" : "AWS::CloudFormation::WaitCondition",
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"DependsOn" : "LB_instance",
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"Properties" : {
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"Handle" : {"Ref" : "WaitHandle"},
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"Timeout" : "600"
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}
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}
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},
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"Outputs": {
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"PublicIp": {
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"Value": { "Fn::GetAtt": [ "LB_instance", "PublicIp" ] },
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"Description": "instance IP"
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}
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}
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}
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'''
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# Allow user to provide alternative nested stack template to the above
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loadbalancer_opts = [
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cfg.StrOpt('loadbalancer_template',
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help='Custom template for the built-in '
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'loadbalancer nested stack.')]
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cfg.CONF.register_opts(loadbalancer_opts)
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class LoadBalancer(stack_resource.StackResource):
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"""Implements a HAProxy-bearing instance as a nested stack.
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The template for the nested stack can be redefined with
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``loadbalancer_template`` option in ``heat.conf``.
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Generally the image used for the instance must have the following
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packages installed or available for installation at runtime::
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- heat-cfntools and its dependencies like python-psutil
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- cronie
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- socat
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- haproxy
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Current default builtin template uses Fedora 21 x86_64 base cloud image
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(https://getfedora.org/cloud/download/)
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and apart from installing packages goes through some hoops
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around SELinux due to pecularities of heat-cfntools.
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"""
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PROPERTIES = (
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AVAILABILITY_ZONES, HEALTH_CHECK, INSTANCES, LISTENERS,
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APP_COOKIE_STICKINESS_POLICY, LBCOOKIE_STICKINESS_POLICY,
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SECURITY_GROUPS, SUBNETS,
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) = (
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'AvailabilityZones', 'HealthCheck', 'Instances', 'Listeners',
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'AppCookieStickinessPolicy', 'LBCookieStickinessPolicy',
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'SecurityGroups', 'Subnets',
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)
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_HEALTH_CHECK_KEYS = (
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HEALTH_CHECK_HEALTHY_THRESHOLD, HEALTH_CHECK_INTERVAL,
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HEALTH_CHECK_TARGET, HEALTH_CHECK_TIMEOUT,
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HEALTH_CHECK_UNHEALTHY_THRESHOLD,
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) = (
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'HealthyThreshold', 'Interval',
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'Target', 'Timeout',
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'UnhealthyThreshold',
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)
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_LISTENER_KEYS = (
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LISTENER_INSTANCE_PORT, LISTENER_LOAD_BALANCER_PORT, LISTENER_PROTOCOL,
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LISTENER_SSLCERTIFICATE_ID, LISTENER_POLICY_NAMES,
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) = (
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'InstancePort', 'LoadBalancerPort', 'Protocol',
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'SSLCertificateId', 'PolicyNames',
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)
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ATTRIBUTES = (
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CANONICAL_HOSTED_ZONE_NAME, CANONICAL_HOSTED_ZONE_NAME_ID, DNS_NAME,
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SOURCE_SECURITY_GROUP_GROUP_NAME, SOURCE_SECURITY_GROUP_OWNER_ALIAS,
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) = (
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'CanonicalHostedZoneName', 'CanonicalHostedZoneNameID', 'DNSName',
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'SourceSecurityGroup.GroupName', 'SourceSecurityGroup.OwnerAlias',
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)
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properties_schema = {
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AVAILABILITY_ZONES: properties.Schema(
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properties.Schema.LIST,
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_('The Availability Zones in which to create the load balancer.'),
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required=True
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),
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HEALTH_CHECK: properties.Schema(
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properties.Schema.MAP,
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_('An application health check for the instances.'),
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schema={
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HEALTH_CHECK_HEALTHY_THRESHOLD: properties.Schema(
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properties.Schema.NUMBER,
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_('The number of consecutive health probe successes '
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'required before moving the instance to the '
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'healthy state.'),
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required=True
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),
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HEALTH_CHECK_INTERVAL: properties.Schema(
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properties.Schema.NUMBER,
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_('The approximate interval, in seconds, between '
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'health checks of an individual instance.'),
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required=True
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),
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HEALTH_CHECK_TARGET: properties.Schema(
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properties.Schema.STRING,
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_('The port being checked.'),
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required=True
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),
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HEALTH_CHECK_TIMEOUT: properties.Schema(
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properties.Schema.NUMBER,
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_('Health probe timeout, in seconds.'),
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required=True
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),
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HEALTH_CHECK_UNHEALTHY_THRESHOLD: properties.Schema(
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properties.Schema.NUMBER,
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_('The number of consecutive health probe failures '
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'required before moving the instance to the '
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'unhealthy state'),
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required=True
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),
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}
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),
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INSTANCES: properties.Schema(
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properties.Schema.LIST,
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_('The list of instance IDs load balanced.'),
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update_allowed=True
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),
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LISTENERS: properties.Schema(
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properties.Schema.LIST,
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_('One or more listeners for this load balancer.'),
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schema=properties.Schema(
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properties.Schema.MAP,
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schema={
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LISTENER_INSTANCE_PORT: properties.Schema(
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properties.Schema.NUMBER,
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_('TCP port on which the instance server is '
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'listening.'),
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required=True
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),
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LISTENER_LOAD_BALANCER_PORT: properties.Schema(
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properties.Schema.NUMBER,
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_('The external load balancer port number.'),
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required=True
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),
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LISTENER_PROTOCOL: properties.Schema(
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properties.Schema.STRING,
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_('The load balancer transport protocol to use.'),
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required=True,
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constraints=[
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constraints.AllowedValues(['TCP', 'HTTP']),
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]
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),
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LISTENER_SSLCERTIFICATE_ID: properties.Schema(
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properties.Schema.STRING,
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_('Not Implemented.'),
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implemented=False
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),
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LISTENER_POLICY_NAMES: properties.Schema(
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properties.Schema.LIST,
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_('Not Implemented.'),
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implemented=False
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),
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},
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),
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required=True
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),
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APP_COOKIE_STICKINESS_POLICY: properties.Schema(
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properties.Schema.STRING,
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_('Not Implemented.'),
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implemented=False
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),
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LBCOOKIE_STICKINESS_POLICY: properties.Schema(
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properties.Schema.STRING,
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_('Not Implemented.'),
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implemented=False
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),
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SECURITY_GROUPS: properties.Schema(
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properties.Schema.STRING,
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_('Not Implemented.'),
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implemented=False
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),
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SUBNETS: properties.Schema(
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properties.Schema.LIST,
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_('Not Implemented.'),
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implemented=False
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),
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}
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attributes_schema = {
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CANONICAL_HOSTED_ZONE_NAME: attributes.Schema(
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_("The name of the hosted zone that is associated with the "
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"LoadBalancer.")
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),
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CANONICAL_HOSTED_ZONE_NAME_ID: attributes.Schema(
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_("The ID of the hosted zone name that is associated with the "
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"LoadBalancer.")
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),
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DNS_NAME: attributes.Schema(
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_("The DNS name for the LoadBalancer.")
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),
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SOURCE_SECURITY_GROUP_GROUP_NAME: attributes.Schema(
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_("The security group that you can use as part of your inbound "
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"rules for your LoadBalancer's back-end instances.")
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),
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SOURCE_SECURITY_GROUP_OWNER_ALIAS: attributes.Schema(
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_("Owner of the source security group.")
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),
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}
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def _haproxy_config_global(self):
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return '''
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global
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daemon
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maxconn 256
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stats socket /tmp/.haproxy-stats
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defaults
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mode http
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timeout connect 5000ms
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timeout client 50000ms
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timeout server 50000ms
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'''
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def _haproxy_config_frontend(self):
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listener = self.properties[self.LISTENERS][0]
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lb_port = listener[self.LISTENER_LOAD_BALANCER_PORT]
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return '''
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frontend http
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bind *:%s
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default_backend servers
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''' % (lb_port)
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def _haproxy_config_backend(self):
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health_chk = self.properties[self.HEALTH_CHECK]
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if health_chk:
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timeout = int(health_chk[self.HEALTH_CHECK_TIMEOUT])
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timeout_check = 'timeout check %ds' % timeout
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spaces = ' '
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else:
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timeout_check = ''
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spaces = ''
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return '''
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backend servers
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balance roundrobin
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option http-server-close
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option forwardfor
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option httpchk
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%s%s
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''' % (spaces, timeout_check)
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def _haproxy_config_servers(self, instances):
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listener = self.properties[self.LISTENERS][0]
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inst_port = listener[self.LISTENER_INSTANCE_PORT]
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spaces = ' '
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check = ''
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health_chk = self.properties[self.HEALTH_CHECK]
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if health_chk:
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check = ' check inter %ss fall %s rise %s' % (
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health_chk[self.HEALTH_CHECK_INTERVAL],
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health_chk[self.HEALTH_CHECK_UNHEALTHY_THRESHOLD],
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health_chk[self.HEALTH_CHECK_HEALTHY_THRESHOLD])
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servers = []
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n = 1
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nova_cp = self.client_plugin('nova')
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for i in instances or []:
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ip = nova_cp.server_to_ipaddress(i) or '0.0.0.0'
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LOG.debug('haproxy server:%s' % ip)
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servers.append('%sserver server%d %s:%s%s' % (spaces, n,
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ip, inst_port,
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check))
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n = n + 1
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return '\n'.join(servers)
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def _haproxy_config(self, instances):
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# initial simplifications:
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# - only one Listener
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# - only http (no tcp or ssl)
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#
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# option httpchk HEAD /check.txt HTTP/1.0
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return '%s%s%s%s\n' % (self._haproxy_config_global(),
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self._haproxy_config_frontend(),
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self._haproxy_config_backend(),
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self._haproxy_config_servers(instances))
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def get_parsed_template(self):
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if cfg.CONF.loadbalancer_template:
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with open(cfg.CONF.loadbalancer_template) as templ_fd:
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LOG.info(_LI('Using custom loadbalancer template %s'),
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cfg.CONF.loadbalancer_template)
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contents = templ_fd.read()
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else:
|
|
contents = lb_template_default
|
|
return template_format.parse(contents)
|
|
|
|
def child_params(self):
|
|
params = {}
|
|
|
|
# If the owning stack defines KeyName, we use that key for the nested
|
|
# template, otherwise use no key
|
|
if 'KeyName' in self.stack.parameters:
|
|
params['KeyName'] = self.stack.parameters['KeyName']
|
|
|
|
return params
|
|
|
|
def child_template(self):
|
|
templ = self.get_parsed_template()
|
|
|
|
# If the owning stack defines KeyName, we use that key for the nested
|
|
# template, otherwise use no key
|
|
if 'KeyName' not in self.stack.parameters:
|
|
del templ['Resources']['LB_instance']['Properties']['KeyName']
|
|
del templ['Parameters']['KeyName']
|
|
|
|
return templ
|
|
|
|
def handle_create(self):
|
|
templ = self.child_template()
|
|
params = self.child_params()
|
|
|
|
if self.properties[self.INSTANCES]:
|
|
md = templ['Resources']['LB_instance']['Metadata']
|
|
files = md['AWS::CloudFormation::Init']['config']['files']
|
|
cfg = self._haproxy_config(self.properties[self.INSTANCES])
|
|
files['/etc/haproxy/haproxy.cfg']['content'] = cfg
|
|
|
|
return self.create_with_template(templ, params)
|
|
|
|
def handle_update(self, json_snippet, tmpl_diff, prop_diff):
|
|
'''
|
|
re-generate the Metadata
|
|
save it to the db.
|
|
rely on the cfn-hup to reconfigure HAProxy
|
|
'''
|
|
new_props = json_snippet.properties(self.properties_schema,
|
|
self.context)
|
|
|
|
# Valid use cases are:
|
|
# - Membership controlled by members property in template
|
|
# - Empty members property in template; membership controlled by
|
|
# "updates" triggered from autoscaling group.
|
|
# Mixing the two will lead to undefined behaviour.
|
|
if (self.INSTANCES in prop_diff and
|
|
(self.properties[self.INSTANCES] is not None or
|
|
new_props[self.INSTANCES] is not None)):
|
|
cfg = self._haproxy_config(prop_diff[self.INSTANCES])
|
|
|
|
md = self.nested()['LB_instance'].metadata_get()
|
|
files = md['AWS::CloudFormation::Init']['config']['files']
|
|
files['/etc/haproxy/haproxy.cfg']['content'] = cfg
|
|
|
|
self.nested()['LB_instance'].metadata_set(md)
|
|
|
|
def check_update_complete(self, updater):
|
|
"""Because we are not calling update_with_template, return True."""
|
|
return True
|
|
|
|
def handle_delete(self):
|
|
return self.delete_nested()
|
|
|
|
def validate(self):
|
|
'''
|
|
Validate any of the provided params
|
|
'''
|
|
res = super(LoadBalancer, self).validate()
|
|
if res:
|
|
return res
|
|
|
|
if (cfg.CONF.loadbalancer_template and
|
|
not os.access(cfg.CONF.loadbalancer_template, os.R_OK)):
|
|
msg = _('Custom LoadBalancer template can not be found')
|
|
raise exception.StackValidationFailed(message=msg)
|
|
|
|
health_chk = self.properties[self.HEALTH_CHECK]
|
|
if health_chk:
|
|
interval = float(health_chk[self.HEALTH_CHECK_INTERVAL])
|
|
timeout = float(health_chk[self.HEALTH_CHECK_TIMEOUT])
|
|
if interval < timeout:
|
|
return {'Error':
|
|
'Interval must be larger than Timeout'}
|
|
|
|
def FnGetRefId(self):
|
|
return six.text_type(self.name)
|
|
|
|
def _resolve_attribute(self, name):
|
|
'''
|
|
We don't really support any of these yet.
|
|
'''
|
|
if name == self.DNS_NAME:
|
|
return self.get_output('PublicIp')
|
|
elif name in self.attributes_schema:
|
|
# Not sure if we should return anything for the other attribs
|
|
# since they aren't really supported in any meaningful way
|
|
return ''
|
|
|
|
|
|
def resource_mapping():
|
|
return {
|
|
'AWS::ElasticLoadBalancing::LoadBalancer': LoadBalancer,
|
|
}
|