0d762a5aeb
“any IP address to access to a web server” corrected instance - plural should be used Change-Id: I6b22fd9377979599b149dce699e3af0a3aacc722
186 lines
9.7 KiB
XML
186 lines
9.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<section
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xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="nova_cli_security_groups">
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<title>Add security group and rules</title>
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<para>The following procedure shows you how to add security
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groups and add rules to the default security group.</para>
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<section xml:id="secgroup_add-delete">
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<title>Add or delete a security group</title>
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<para>Security groups can be added with <command>nova
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secgroup-create</command>.</para>
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<para>The following example shows the creation of the
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security group <literal>secure1</literal>. After the
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group is created, it can be viewed in the security
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group list.</para>
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<para>
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<screen><prompt>$</prompt> <userinput>nova secgroup-create secure1 "Test security group"</userinput>
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<computeroutput>+---------+---------------------+
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| Name | Description |
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+---------+---------------------+
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| secure1 | Test security group |
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+---------+---------------------+
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</computeroutput>
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<prompt>$</prompt> <userinput>nova secgroup-list</userinput>
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<computeroutput>+---------+---------------------+
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| Name | Description |
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+---------+---------------------+
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| default | default |
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| secure1 | Test security group |
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+---------+---------------------+</computeroutput></screen>
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</para>
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<para>Security groups can be deleted with <command>nova secgroup-delete</command>. The default
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security group cannot be deleted. The default security group contains these initial
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settings:<itemizedlist>
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<listitem>
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<para>All the traffic originated by the instances (outbound traffic) is
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allowed</para>
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</listitem>
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<listitem>
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<para>All the traffic destined to instances
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(inbound traffic) is denied</para>
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</listitem>
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<listitem>
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<para>All the instances inside the group are allowed to talk to each
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other</para>
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</listitem>
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</itemizedlist>
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<note>
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<para>You can add extra rules into the default security group for handling the egress
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traffic. Rules are ingress only at this time.</para>
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</note>
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</para>
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<para>In the following example, the group
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<literal>secure1</literal> is deleted. When you
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view the security group list, it no longer
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appears.</para>
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<para>
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<screen><prompt>$</prompt> <userinput>nova secgroup-delete secure1</userinput>
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<prompt>$</prompt> <userinput>nova secgroup-list</userinput>
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<computeroutput>+---------+-------------+
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| Name | Description |
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+---------+-------------+
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| default | default |
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+---------+-------------+</computeroutput></screen>
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</para>
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</section>
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<section xml:id="secgroup_rules">
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<title>Modify security group rules</title>
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<para>The security group rules control the incoming traffic that is allowed to the instances
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in the group, while all outbound traffic is automatically allowed. <note>
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<para>It is not possible to change the default outbound behaviour.</para>
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</note>Every security group rule is a policy which allows you to specify inbound
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connections that are allowed to access the instance, by source address, destination
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port and IP protocol,(TCP, UDP or ICMP). Currently, ipv6 and other protocols cannot
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be managed with the security rules, making them permitted by default. To manage
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such, you can deploy a firewall in front of your OpenStack cloud to control other
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types of traffic. The command requires the following arguments for both TCP and UDP
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rules : <itemizedlist>
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<listitem>
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<para><secgroup> ID of security group.</para>
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</listitem>
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<listitem>
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<para><ip_proto> IP protocol (icmp, tcp, udp).</para>
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</listitem>
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<listitem>
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<para><from_port> Port at start of range.</para>
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</listitem>
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<listitem>
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<para><to_port> Port at end of range.</para>
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</listitem>
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<listitem>
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<para><cidr> CIDR for address range.</para>
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</listitem>
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</itemizedlist></para>
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<para>For ICMP rules, instead of specifying a begin and end port, you specify the
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allowed ICMP code and ICMP type: <itemizedlist>
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<listitem>
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<para><secgroup> ID of security group.</para>
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</listitem>
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<listitem>
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<para><ip_proto> IP protocol (with icmp specified).</para>
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</listitem>
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<listitem>
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<para><ICMP_code> The ICMP code.</para>
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</listitem>
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<listitem>
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<para><ICMP_type> The ICMP type.</para>
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</listitem>
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<listitem>
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<para><cidr> CIDR for the source address range.</para>
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</listitem>
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</itemizedlist>
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<note>
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<para>Entering "-1" for both code and type
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indicates that all ICMP codes and types should
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be allowed.</para>
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</note>
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</para>
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<para>
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<note>
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<title>The CIDR notation</title>
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<para>That notation allows you to specify a base IP address and a suffix that
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designates the number of significant bits in the IP address used to identify
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the network. For example, by specifying a 88.170.60.32/27, you specify
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88.170.60.32 as the <emphasis role="bold">base IP</emphasis> and 27 as the
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<emphasis role="bold">suffix</emphasis>. Since you use an IPV4 format,
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there are only 5 bits available for the host part (32 minus 27). The
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0.0.0.0/0 notation means you allow the entire IPV4 range, meaning allowing
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all addresses.</para>
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</note></para>
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<para>For example, in order to allow any IP address to
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access a web server running on one of your instances
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inside the default security
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group:<screen><prompt>$</prompt> <userinput>nova secgroup-add-rule default tcp 80 80 0.0.0.0/0</userinput>
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<computeroutput>+-------------+-----------+---------+-----------+--------------+
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| IP Protocol | From Port | To Port | IP Range | Source Group |
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+-------------+-----------+---------+-----------+--------------+
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| tcp | 80 | 80 | 0.0.0.0/0 | |
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+-------------+-----------+---------+-----------+--------------+</computeroutput></screen>
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</para>
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<para>In order to allow any IP address to ping an instance
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inside the default security group (Code 0, Type 8 for
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the ECHO
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request.):<screen><prompt>$</prompt> <userinput>nova secgroup-add-rule default icmp 0 8 0.0.0.0/0</userinput>
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<computeroutput>+-------------+-----------+---------+-----------+--------------+
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| IP Protocol | From Port | To Port | IP Range | Source Group |
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+-------------+-----------+---------+-----------+--------------+
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| icmp | 0 | 8 | 0.0.0.0/0 | |
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+-------------+-----------+---------+-----------+--------------+</computeroutput></screen>
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</para>
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<para>
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<screen><prompt>$</prompt> <userinput>nova secgroup-list-rules default</userinput>
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<computeroutput>+-------------+-----------+---------+-----------+--------------+
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| IP Protocol | From Port | To Port | IP Range | Source Group |
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+-------------+-----------+---------+-----------+--------------+
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| tcp | 80 | 80 | 0.0.0.0/0 | |
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| icmp | 0 | 8 | 0.0.0.0/0 | |
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+-------------+-----------+---------+-----------+--------------+</computeroutput></screen>
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</para>
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<para>In order to delete a rule, you need to specify the exact same arguments you used
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to create it:<itemizedlist>
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<listitem>
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<para><secgroup> ID of security group.</para>
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</listitem>
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<listitem>
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<para><ip_proto> IP protocol (icmp, tcp, udp).</para>
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</listitem>
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<listitem>
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<para><from_port> Port at start of range.</para>
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</listitem>
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<listitem>
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<para><to_port> Port at end of range.</para>
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</listitem>
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<listitem>
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<para><cidr> CIDR for address range.</para>
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</listitem>
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</itemizedlist><screen><prompt>$</prompt> <userinput>nova secgroup-delete-rule default tcp 80 80 0.0.0.0/0</userinput></screen>
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</para>
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</section>
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</section>
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