前言
在openstack中，每个VM启动时，和后续ip地址续期时，都需要依赖于DHCP服务，进行IP地址的分发，但是当集群规模变大后，如果仅有一个DHCP agent，会导致服务可用性降低，并且，DHCP agent进程也会因为负荷过大，影响使用，这在当同时创建上百台VM同时启动时尤为明显。
多DHCP agent实现
配置文件修改
控制节点
修改控制节点/etc/neutron/neutron.conf
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[DEFAULT]
core_plugin = linuxbridge
rabbit_host = controlnode
allow_overlapping_ips = True
host = controlnode
agent_down_time = 5
dhcp_agents_per_network = 3
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计算节点
编辑vi /etc/neutron/dhcp_agent.ini
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[DEFAULT]
interface_driver = neutron.agent.linux.interface.BridgeInterfaceDriver
dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
enable_isolated_metadata = True
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启动服务
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systemctl enable neutron-dhcp-agent.service
systemctl start neutron-dhcp-agent.service
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验证
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neutron agent-list
+--------------------------------------+--------------------+-------+-------+----------------+
| id | agent_type | host | alive | admin_state_up |
+--------------------------------------+--------------------+-------+-------+----------------+
| 1b69828d-6a9b-4826-87cd-1757f0e27f31 | Linux bridge agent | HostA | :-) | True |
| a0c1c21c-d4f4-4577-9ec7-908f2d48622d | DHCP agent | HostA | :-) | True |
| ed96b856-ae0f-4d75-bb28-40a47ffd7695 | Linux bridge agent | HostB | :-) | True |
| f28aa126-6edb-4ea5-a81e-8850876bc0a8 | DHCP agent | HostB | :-) | True |
+--------------------------------------+--------------------+-------+-------+----------------+
列出指定host的dhcp agent
neutron dhcp-agent-list-hosting-net net1
+--------------------------------------+-------+----------------+-------+
| id | host | admin_state_up | alive |
+--------------------------------------+-------+----------------+-------+
| a0c1c21c-d4f4-4577-9ec7-908f2d48622d | HostA | True | :-) |
+--------------------------------------+-------+----------------+-------+
列出dhcp agent 管理的子网
neutron net-list-on-dhcp-agent a0c1c21c-d4f4-4577-9ec7-908f2d48622d
+--------------------------------------+------+--------------------------------------------------+
| id | name | subnets |
+--------------------------------------+------+--------------------------------------------------+
| 89dca1c6-c7d4-4f7a-b730-549af0fb6e34 | net1 | f6c832e3-9968-46fd-8e45-d5cf646db9d1 10.0.1.0/24 |
+--------------------------------------+------+--------------------------------------------------+
显示agent的详情
neutron agent-show a0c1c21c-d4f4-4577-9ec7-908f2d48622d
+---------------------+--------------------------------------------------------+
| Field | Value |
+---------------------+--------------------------------------------------------+
| admin_state_up | True |
| agent_type | DHCP agent |
| alive | False |
| binary | neutron-dhcp-agent |
| configurations | { |
| | "subnets": 1, |
| | "dhcp_driver": "neutron.agent.linux.dhcp.Dnsmasq", |
| | "networks": 1, |
| | "dhcp_lease_time": 120, |
| | "ports": 3 |
| | } |
| created_at | 2013-03-16T01:16:18.000000 |
| description | |
| heartbeat_timestamp | 2013-03-17T01:37:22.000000 |
| host | HostA |
| id | 58f4ce07-6789-4bb3-aa42-ed3779db2b03 |
| started_at | 2013-03-16T06:48:39.000000 |
| topic | dhcp_agent |
+---------------------+--------------------------------------------------------+
|