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410 lines
15 KiB
410 lines
15 KiB
#!/bin/bash
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#
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# lib/apache
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# Functions to control configuration and operation of apache web server
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# Dependencies:
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#
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# - ``functions`` file
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# - ``STACK_USER`` must be defined
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#
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# lib/apache exports the following functions:
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#
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# - install_apache_wsgi
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# - apache_site_config_for
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# - enable_apache_site
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# - disable_apache_site
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# - start_apache_server
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# - stop_apache_server
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# - restart_apache_server
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# Save trace setting
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_XTRACE_LIB_APACHE=$(set +o | grep xtrace)
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set +o xtrace
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# Allow overriding the default Apache user and group, default to
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# current user and his default group.
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APACHE_USER=${APACHE_USER:-$STACK_USER}
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APACHE_GROUP=${APACHE_GROUP:-$(id -gn $APACHE_USER)}
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# Set up apache name and configuration directory
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# Note that APACHE_CONF_DIR is really more accurately apache's vhost
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# configuration dir but we can't just change this because public interfaces.
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if is_ubuntu; then
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APACHE_NAME=apache2
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APACHE_CONF_DIR=${APACHE_CONF_DIR:-/etc/$APACHE_NAME/sites-available}
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APACHE_SETTINGS_DIR=${APACHE_SETTINGS_DIR:-/etc/$APACHE_NAME/conf-enabled}
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elif is_fedora; then
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APACHE_NAME=httpd
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APACHE_CONF_DIR=${APACHE_CONF_DIR:-/etc/$APACHE_NAME/conf.d}
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APACHE_SETTINGS_DIR=${APACHE_SETTINGS_DIR:-/etc/$APACHE_NAME/conf.d}
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elif is_suse; then
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APACHE_NAME=apache2
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APACHE_CONF_DIR=${APACHE_CONF_DIR:-/etc/$APACHE_NAME/vhosts.d}
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APACHE_SETTINGS_DIR=${APACHE_SETTINGS_DIR:-/etc/$APACHE_NAME/conf.d}
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fi
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APACHE_LOG_DIR="/var/log/${APACHE_NAME}"
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# Functions
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# ---------
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# Enable apache mod and restart apache if it isn't already enabled.
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function enable_apache_mod {
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local mod=$1
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# Apache installation, because we mark it NOPRIME
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if is_ubuntu; then
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# Skip mod_version as it is not a valid mod to enable
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# on debuntu, instead it is built in.
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if [[ "$mod" != "version" ]] && ! a2query -m $mod ; then
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sudo a2enmod $mod
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restart_apache_server
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fi
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elif is_suse; then
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if ! a2enmod -q $mod ; then
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sudo a2enmod $mod
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restart_apache_server
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fi
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elif is_fedora; then
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# pass
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true
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else
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exit_distro_not_supported "apache enable mod"
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fi
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}
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# NOTE(sdague): Install uwsgi including apache module, we need to get
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# to 2.0.6+ to get a working mod_proxy_uwsgi. We can probably build a
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# check for that and do it differently for different platforms.
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function install_apache_uwsgi {
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local apxs="apxs2"
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if is_fedora; then
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apxs="apxs"
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fi
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# This varies based on packaged/installed. If we've
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# pip_installed, then the pip setup will only build a "python"
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# module that will be either python2 or python3 depending on what
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# it was built with.
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#
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# For package installs, the distro ships both plugins and you need
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# to select the right one ... it will not be autodetected.
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UWSGI_PYTHON_PLUGIN=python3
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if is_ubuntu; then
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local pkg_list="uwsgi uwsgi-plugin-python3 libapache2-mod-proxy-uwsgi"
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if [[ "$DISTRO" == 'bionic' ]]; then
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pkg_list="${pkg_list} uwsgi-plugin-python"
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fi
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install_package ${pkg_list}
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elif is_fedora; then
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# Note httpd comes with mod_proxy_uwsgi and it is loaded by
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# default; the mod_proxy_uwsgi package actually conflicts now.
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# See:
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# https://bugzilla.redhat.com/show_bug.cgi?id=1574335
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#
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# Thus there is nothing else to do after this install
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install_package uwsgi \
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uwsgi-plugin-python3
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elif [[ $os_VENDOR =~ openSUSE ]]; then
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install_package uwsgi \
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uwsgi-python3 \
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apache2-mod_uwsgi
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else
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# Compile uwsgi from source.
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local dir
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dir=$(mktemp -d)
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pushd $dir
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pip_install uwsgi
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pip download uwsgi -c $REQUIREMENTS_DIR/upper-constraints.txt
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local uwsgi
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uwsgi=$(ls uwsgi*)
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tar xvf $uwsgi
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cd uwsgi*/apache2
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sudo $apxs -i -c mod_proxy_uwsgi.c
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popd
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# delete the temp directory
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sudo rm -rf $dir
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UWSGI_PYTHON_PLUGIN=python
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fi
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if is_ubuntu || is_suse ; then
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# we've got to enable proxy and proxy_uwsgi for this to work
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sudo a2enmod proxy
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sudo a2enmod proxy_uwsgi
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elif is_fedora; then
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# redhat is missing a nice way to turn on/off modules
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echo "LoadModule proxy_uwsgi_module modules/mod_proxy_uwsgi.so" \
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| sudo tee /etc/httpd/conf.modules.d/02-proxy-uwsgi.conf
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fi
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restart_apache_server
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}
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# install_apache_wsgi() - Install Apache server and wsgi module
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function install_apache_wsgi {
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# Apache installation, because we mark it NOPRIME
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if is_ubuntu; then
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# Install apache2, which is NOPRIME'd
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install_package apache2
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if is_package_installed libapache2-mod-wsgi; then
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uninstall_package libapache2-mod-wsgi
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fi
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install_package libapache2-mod-wsgi-py3
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elif is_fedora; then
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sudo rm -f /etc/httpd/conf.d/000-*
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install_package httpd python3-mod_wsgi
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# For consistency with Ubuntu, switch to the worker mpm, as
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# the default is event
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sudo sed -i '/mod_mpm_prefork.so/s/^/#/g' /etc/httpd/conf.modules.d/00-mpm.conf
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sudo sed -i '/mod_mpm_event.so/s/^/#/g' /etc/httpd/conf.modules.d/00-mpm.conf
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sudo sed -i '/mod_mpm_worker.so/s/^#//g' /etc/httpd/conf.modules.d/00-mpm.conf
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elif is_suse; then
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install_package apache2 apache2-mod_wsgi
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else
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exit_distro_not_supported "apache wsgi installation"
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fi
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# WSGI isn't enabled by default, enable it
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enable_apache_mod wsgi
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}
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# apache_site_config_for() - The filename of the site's configuration file.
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# This function uses the global variables APACHE_NAME and APACHE_CONF_DIR.
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#
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# On Ubuntu 14.04+, the site configuration file must have a .conf suffix for a2ensite and a2dissite to
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# recognise it. a2ensite and a2dissite ignore the .conf suffix used as parameter. The default sites'
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# files are 000-default.conf and default-ssl.conf.
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#
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# On Fedora and openSUSE, any file in /etc/httpd/conf.d/ whose name ends with .conf is enabled.
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#
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# On RHEL and CentOS, things should hopefully work as in Fedora.
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#
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# The table below summarizes what should happen on each distribution:
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# +----------------------+--------------------+--------------------------+--------------------------+
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# | Distribution | File name | Site enabling command | Site disabling command |
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# +----------------------+--------------------+--------------------------+--------------------------+
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# | Ubuntu 14.04 | site.conf | a2ensite site | a2dissite site |
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# | Fedora, RHEL, CentOS | site.conf.disabled | mv site.conf{.disabled,} | mv site.conf{,.disabled} |
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# +----------------------+--------------------+--------------------------+--------------------------+
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function apache_site_config_for {
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local site=$@
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if is_ubuntu; then
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# Ubuntu 14.04 - Apache 2.4
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echo $APACHE_CONF_DIR/${site}.conf
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elif is_fedora || is_suse; then
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# fedora conf.d is only imported if it ends with .conf so this is approx the same
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local enabled_site_file="$APACHE_CONF_DIR/${site}.conf"
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if [ -f $enabled_site_file ]; then
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echo ${enabled_site_file}
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else
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echo ${enabled_site_file}.disabled
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fi
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fi
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}
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# enable_apache_site() - Enable a particular apache site
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function enable_apache_site {
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local site=$@
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# Many of our sites use mod version. Just enable it.
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enable_apache_mod version
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if is_ubuntu; then
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sudo a2ensite ${site}
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elif is_fedora || is_suse; then
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local enabled_site_file="$APACHE_CONF_DIR/${site}.conf"
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# Do nothing if site already enabled or no site config exists
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if [[ -f ${enabled_site_file}.disabled ]] && [[ ! -f ${enabled_site_file} ]]; then
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sudo mv ${enabled_site_file}.disabled ${enabled_site_file}
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fi
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fi
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}
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# disable_apache_site() - Disable a particular apache site
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function disable_apache_site {
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local site=$@
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if is_ubuntu; then
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sudo a2dissite ${site} || true
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elif is_fedora || is_suse; then
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local enabled_site_file="$APACHE_CONF_DIR/${site}.conf"
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# Do nothing if no site config exists
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if [[ -f ${enabled_site_file} ]]; then
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sudo mv ${enabled_site_file} ${enabled_site_file}.disabled
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fi
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fi
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}
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# start_apache_server() - Start running apache server
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function start_apache_server {
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start_service $APACHE_NAME
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}
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# stop_apache_server() - Stop running apache server
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function stop_apache_server {
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if [ -n "$APACHE_NAME" ]; then
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stop_service $APACHE_NAME
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else
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exit_distro_not_supported "apache configuration"
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fi
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}
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# restart_apache_server
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function restart_apache_server {
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# Apache can be slow to stop, doing an explicit stop, sleep, start helps
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# to mitigate issues where apache will claim a port it's listening on is
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# still in use and fail to start.
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restart_service $APACHE_NAME
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}
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function write_uwsgi_config {
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local file=$1
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local wsgi=$2
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local url=$3
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local http=$4
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local name=""
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name=$(basename $wsgi)
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# create a home for the sockets; note don't use /tmp -- apache has
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# a private view of it on some platforms.
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local socket_dir='/var/run/uwsgi'
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# /var/run will be empty on ubuntu after reboot, so we can use systemd-temptiles
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# to automatically create $socket_dir.
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sudo mkdir -p /etc/tmpfiles.d/
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echo "d $socket_dir 0755 $STACK_USER root" | sudo tee /etc/tmpfiles.d/uwsgi.conf
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sudo systemd-tmpfiles --create /etc/tmpfiles.d/uwsgi.conf
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local socket="$socket_dir/${name}.socket"
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# always cleanup given that we are using iniset here
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rm -rf $file
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iniset "$file" uwsgi wsgi-file "$wsgi"
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iniset "$file" uwsgi processes $API_WORKERS
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# This is running standalone
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iniset "$file" uwsgi master true
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# Set die-on-term & exit-on-reload so that uwsgi shuts down
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iniset "$file" uwsgi die-on-term true
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iniset "$file" uwsgi exit-on-reload false
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# Set worker-reload-mercy so that worker will not exit till the time
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# configured after graceful shutdown
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iniset "$file" uwsgi worker-reload-mercy $WORKER_TIMEOUT
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iniset "$file" uwsgi enable-threads true
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iniset "$file" uwsgi plugins http,${UWSGI_PYTHON_PLUGIN}
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# uwsgi recommends this to prevent thundering herd on accept.
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iniset "$file" uwsgi thunder-lock true
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# Set hook to trigger graceful shutdown on SIGTERM
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iniset "$file" uwsgi hook-master-start "unix_signal:15 gracefully_kill_them_all"
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# Override the default size for headers from the 4k default.
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iniset "$file" uwsgi buffer-size 65535
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# Make sure the client doesn't try to re-use the connection.
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iniset "$file" uwsgi add-header "Connection: close"
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# This ensures that file descriptors aren't shared between processes.
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iniset "$file" uwsgi lazy-apps true
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# If we said bind directly to http, then do that and don't start the apache proxy
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if [[ -n "$http" ]]; then
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iniset "$file" uwsgi http $http
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else
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local apache_conf=""
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apache_conf=$(apache_site_config_for $name)
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iniset "$file" uwsgi socket "$socket"
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iniset "$file" uwsgi chmod-socket 666
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echo "ProxyPass \"${url}\" \"unix:${socket}|uwsgi://uwsgi-uds-${name}/\" retry=0 " | sudo tee -a $apache_conf
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enable_apache_site $name
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restart_apache_server
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fi
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}
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# For services using chunked encoding, the only services known to use this
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# currently are Glance and Swift, we need to use an http proxy instead of
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# mod_proxy_uwsgi because the chunked encoding gets dropped. See:
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# https://github.com/unbit/uwsgi/issues/1540 You can workaround this on python2
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# but that involves having apache buffer the request before sending it to
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# uwsgi.
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function write_local_uwsgi_http_config {
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local file=$1
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local wsgi=$2
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local url=$3
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name=$(basename $wsgi)
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# create a home for the sockets; note don't use /tmp -- apache has
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# a private view of it on some platforms.
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# always cleanup given that we are using iniset here
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rm -rf $file
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iniset "$file" uwsgi wsgi-file "$wsgi"
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port=$(get_random_port)
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iniset "$file" uwsgi http-socket "127.0.0.1:$port"
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iniset "$file" uwsgi processes $API_WORKERS
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# This is running standalone
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iniset "$file" uwsgi master true
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# Set die-on-term & exit-on-reload so that uwsgi shuts down
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iniset "$file" uwsgi die-on-term true
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iniset "$file" uwsgi exit-on-reload false
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iniset "$file" uwsgi enable-threads true
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iniset "$file" uwsgi plugins http,${UWSGI_PYTHON_PLUGIN}
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# uwsgi recommends this to prevent thundering herd on accept.
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iniset "$file" uwsgi thunder-lock true
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# Set hook to trigger graceful shutdown on SIGTERM
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iniset "$file" uwsgi hook-master-start "unix_signal:15 gracefully_kill_them_all"
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# Set worker-reload-mercy so that worker will not exit till the time
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# configured after graceful shutdown
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iniset "$file" uwsgi worker-reload-mercy $WORKER_TIMEOUT
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# Override the default size for headers from the 4k default.
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iniset "$file" uwsgi buffer-size 65535
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# Make sure the client doesn't try to re-use the connection.
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iniset "$file" uwsgi add-header "Connection: close"
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# This ensures that file descriptors aren't shared between processes.
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iniset "$file" uwsgi lazy-apps true
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iniset "$file" uwsgi chmod-socket 666
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iniset "$file" uwsgi http-raw-body true
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iniset "$file" uwsgi http-chunked-input true
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iniset "$file" uwsgi http-auto-chunked true
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iniset "$file" uwsgi http-keepalive false
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# Increase socket timeout for slow chunked uploads
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iniset "$file" uwsgi socket-timeout 30
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enable_apache_mod proxy
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enable_apache_mod proxy_http
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local apache_conf=""
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apache_conf=$(apache_site_config_for $name)
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echo "KeepAlive Off" | sudo tee $apache_conf
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echo "SetEnv proxy-sendchunked 1" | sudo tee -a $apache_conf
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echo "ProxyPass \"${url}\" \"http://127.0.0.1:$port\" retry=0 " | sudo tee -a $apache_conf
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enable_apache_site $name
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restart_apache_server
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}
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# Write a straight-through proxy for a service that runs locally and just needs
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# to be reachable via the main http proxy at $loc
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function write_local_proxy_http_config {
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local name=$1
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local url=$2
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local loc=$3
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local apache_conf
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apache_conf=$(apache_site_config_for $name)
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enable_apache_mod proxy
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enable_apache_mod proxy_http
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echo "KeepAlive Off" | sudo tee $apache_conf
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echo "SetEnv proxy-sendchunked 1" | sudo tee -a $apache_conf
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echo "ProxyPass \"${loc}\" \"$url\" retry=0 " | sudo tee -a $apache_conf
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enable_apache_site $name
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restart_apache_server
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}
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function remove_uwsgi_config {
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local file=$1
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local wsgi=$2
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local name=""
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name=$(basename $wsgi)
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rm -rf $file
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disable_apache_site $name
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}
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# Restore xtrace
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$_XTRACE_LIB_APACHE
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# Tell emacs to use shell-script-mode
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## Local variables:
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## mode: shell-script
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## End:
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