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keepalived Transition & Entering {MASTER|BACKUP|FAULT} STATE & first priority affect by track interface|script

2016-04-05 4183
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简介：
本例主要说明1个问题, 当使用脚本或接口的动态优先级调整时, 什么时候优先级会生效.

路由器进入状态后, 动态优先级才会被调整, 没有进入状态前的track都不会影响优先级.
用两个例子来说明问题.
并且初始状态为MASTER和BACKUP, track的先后是有差别的.
如果初始状态时MASTER, 那么是先执行track(此时的脚本调用结果不影响路由器优先级), 然后Transition to MASTER STATE. 
如果初始状态是BACKUP, 那么是先Entering to BACKUP STATE, 然后执行脚本 (此时的脚本调用结果会影响路由器优先级) .

例子1 : 
route A : BACKUP, priority=99, track_script+3 weight, !nopreempt
route B : MASTER, priority=100, track_script+3 weight, !nopreempt

先启动A, 
keepalived -f /opt/keepalived/etc/keepalived/keepalived.conf -D
日志 : 
Aug 25 15:21:35 192_168_173_203 Keepalived[25763]: Starting Keepalived v1.2.13 (08/19,2014)
Aug 25 15:21:35 192_168_173_203 Keepalived[25764]: Starting Healthcheck child process, pid=25765
Aug 25 15:21:35 192_168_173_203 Keepalived[25764]: Starting VRRP child process, pid=25766
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Netlink reflector reports IP 192.168.173.203 added
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Netlink reflector reports IP 192.168.173.156 added
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Netlink reflector reports IP fe80::f6ce:46ff:fe86:4234 added
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Registering Kernel netlink reflector
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Netlink reflector reports IP 192.168.173.203 added
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Netlink reflector reports IP 192.168.173.156 added
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Registering Kernel netlink command channel
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Netlink reflector reports IP fe80::f6ce:46ff:fe86:4234 added
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Registering gratuitous ARP shared channel
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Registering Kernel netlink reflector
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Registering Kernel netlink command channel
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Configuration is using : 7942 Bytes
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Configuration is using : 69324 Bytes
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: Using LinkWatch kernel netlink reflector...
注意用词Entering, 是进入BACKUP状态, 而不是向BACKUP状态转变.
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Instance(vi_1) Entering BACKUP STATE
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: VRRP sockpool: [ifindex(2), proto(112), unicast(1), fd(10,11)]
Aug 25 15:21:35 192_168_173_203 Keepalived_healthcheckers[25765]: Using LinkWatch kernel netlink reflector...
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Script(nag) succeeded
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Script(zero) succeeded
Aug 25 15:21:35 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Script(pos) succeeded
优先级99+3=102
Aug 25 15:21:39 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Instance(vi_1) Transition to MASTER STATE
Aug 25 15:21:40 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Instance(vi_1) Entering MASTER STATE
Aug 25 15:21:40 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Instance(vi_1) setting protocol VIPs.
Aug 25 15:21:40 192_168_173_203 Keepalived_vrrp[25766]: VRRP_Instance(vi_1) Sending gratuitous ARPs on eth0 for 172.16.173.100
Aug 25 15:21:40 192_168_173_203 Keepalived_healthcheckers[25765]: Netlink reflector reports IP 172.16.173.100 added

再启动B, 
keepalived -f /opt/keepalived/etc/keepalived/keepalived.conf -D
日志 : 
Aug 25 15:26:27 192_168_173_204 Keepalived[8192]: Starting Keepalived v1.2.13 (08/19,2014)
Aug 25 15:26:27 192_168_173_204 Keepalived[8193]: Starting Healthcheck child process, pid=8194
Aug 25 15:26:27 192_168_173_204 Keepalived[8193]: Starting VRRP child process, pid=8196
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Netlink reflector reports IP 192.168.173.204 added
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Netlink reflector reports IP fe80::f6ce:46ff:fe85:15fc added
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Registering Kernel netlink reflector
Aug 25 15:26:27 192_168_173_204 Keepalived_healthcheckers[8194]: Netlink reflector reports IP 192.168.173.204 added
Aug 25 15:26:27 192_168_173_204 Keepalived_healthcheckers[8194]: Netlink reflector reports IP fe80::f6ce:46ff:fe85:15fc added
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Registering Kernel netlink command channel
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Registering gratuitous ARP shared channel
Aug 25 15:26:27 192_168_173_204 Keepalived_healthcheckers[8194]: Registering Kernel netlink reflector
Aug 25 15:26:27 192_168_173_204 Keepalived_healthcheckers[8194]: Registering Kernel netlink command channel
Aug 25 15:26:27 192_168_173_204 Keepalived_healthcheckers[8194]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:26:27 192_168_173_204 Keepalived_healthcheckers[8194]: Configuration is using : 7944 Bytes
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Configuration is using : 69326 Bytes
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: Using LinkWatch kernel netlink reflector...
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: VRRP sockpool: [ifindex(2), proto(112), unicast(1), fd(10,11)]
Aug 25 15:26:27 192_168_173_204 Keepalived_healthcheckers[8194]: Using LinkWatch kernel netlink reflector...
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Script(pos) succeeded
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Script(zero) succeeded
Aug 25 15:26:27 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Script(nag) succeeded
注意用词Transition, 表示现在还不是master, 像master角色转换而已. 转换过程要干些什么, 参考rfc2338.
Aug 25 15:26:28 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) Transition to MASTER STATE
Aug 25 15:26:28 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) Received higher prio advert
第一次竞选MASTER失败, 说明现在track script虽然执行成功了, 但是没有动态变更优先级, 目前优先级还是100
Aug 25 15:26:28 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) Entering BACKUP STATE
第二次竞选成功, 说明已动态变更优先级. 目前优先级100+3=103
Aug 25 15:26:29 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) forcing a new MASTER election
Aug 25 15:26:29 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) forcing a new MASTER election
Aug 25 15:26:30 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) Transition to MASTER STATE
Aug 25 15:26:31 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) Entering MASTER STATE
Aug 25 15:26:31 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) setting protocol VIPs.
Aug 25 15:26:31 192_168_173_204 Keepalived_vrrp[8196]: VRRP_Instance(vi_1) Sending gratuitous ARPs on eth0 for 172.16.173.100
Aug 25 15:26:31 192_168_173_204 Keepalived_healthcheckers[8194]: Netlink reflector reports IP 172.16.173.100 added


例子2 : 
 
route A : BACKUP, priority=100, track_script+3 weight, !nopreempt
route B : MASTER, priority=99, track_script+3 weight, !nopreempt

先启动B, 
keepalived -f /opt/keepalived/etc/keepalived/keepalived.conf -D
日志如下 : 
Aug 25 15:31:12 192_168_173_204 Keepalived[10659]: Starting Keepalived v1.2.13 (08/19,2014)
Aug 25 15:31:12 192_168_173_204 Keepalived[10660]: Starting Healthcheck child process, pid=10661
Aug 25 15:31:12 192_168_173_204 Keepalived[10660]: Starting VRRP child process, pid=10663
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Netlink reflector reports IP 192.168.173.204 added
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Netlink reflector reports IP fe80::f6ce:46ff:fe85:15fc added
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Registering Kernel netlink reflector
Aug 25 15:31:12 192_168_173_204 Keepalived_healthcheckers[10661]: Netlink reflector reports IP 192.168.173.204 added
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Registering Kernel netlink command channel
Aug 25 15:31:12 192_168_173_204 Keepalived_healthcheckers[10661]: Netlink reflector reports IP fe80::f6ce:46ff:fe85:15fc added
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Registering gratuitous ARP shared channel
Aug 25 15:31:12 192_168_173_204 Keepalived_healthcheckers[10661]: Registering Kernel netlink reflector
Aug 25 15:31:12 192_168_173_204 Keepalived_healthcheckers[10661]: Registering Kernel netlink command channel
Aug 25 15:31:12 192_168_173_204 Keepalived_healthcheckers[10661]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:31:12 192_168_173_204 Keepalived_healthcheckers[10661]: Configuration is using : 7942 Bytes
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Configuration is using : 69324 Bytes
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: Using LinkWatch kernel netlink reflector...
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: VRRP sockpool: [ifindex(2), proto(112), unicast(1), fd(10,11)]
Aug 25 15:31:12 192_168_173_204 Keepalived_healthcheckers[10661]: Using LinkWatch kernel netlink reflector...
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: VRRP_Script(pos) succeeded
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: VRRP_Script(nag) succeeded
Aug 25 15:31:12 192_168_173_204 Keepalived_vrrp[10663]: VRRP_Script(zero) succeeded
现在的优先级是99
Aug 25 15:31:13 192_168_173_204 Keepalived_vrrp[10663]: VRRP_Instance(vi_1) Transition to MASTER STATE
Aug 25 15:31:14 192_168_173_204 Keepalived_vrrp[10663]: VRRP_Instance(vi_1) Entering MASTER STATE
现在的优先级是99+3=102
Aug 25 15:31:14 192_168_173_204 Keepalived_vrrp[10663]: VRRP_Instance(vi_1) setting protocol VIPs.
Aug 25 15:31:14 192_168_173_204 Keepalived_vrrp[10663]: VRRP_Instance(vi_1) Sending gratuitous ARPs on eth0 for 172.16.173.100
Aug 25 15:31:14 192_168_173_204 Keepalived_healthcheckers[10661]: Netlink reflector reports IP 172.16.173.100 added


然后启动A, 
keepalived -f /opt/keepalived/etc/keepalived/keepalived.conf -D
日志如下 : 
Aug 25 15:32:11 192_168_173_203 Keepalived[8306]: Starting Keepalived v1.2.13 (08/19,2014)
Aug 25 15:32:11 192_168_173_203 Keepalived[8307]: Starting Healthcheck child process, pid=8308
Aug 25 15:32:11 192_168_173_203 Keepalived[8307]: Starting VRRP child process, pid=8309
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Netlink reflector reports IP 192.168.173.203 added
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Netlink reflector reports IP 192.168.173.156 added
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Netlink reflector reports IP fe80::f6ce:46ff:fe86:4234 added
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Registering Kernel netlink reflector
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Netlink reflector reports IP 192.168.173.203 added
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Registering Kernel netlink command channel
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Netlink reflector reports IP 192.168.173.156 added
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Registering gratuitous ARP shared channel
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Netlink reflector reports IP fe80::f6ce:46ff:fe86:4234 added
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Registering Kernel netlink reflector
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Registering Kernel netlink command channel
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Opening file '/opt/keepalived/etc/keepalived/keepalived.conf'.
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Configuration is using : 7944 Bytes
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Configuration is using : 69326 Bytes
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: Using LinkWatch kernel netlink reflector...
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Instance(vi_1) Entering BACKUP STATE
注意现在的状态是进入BACKUP STATE, 
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: VRRP sockpool: [ifindex(2), proto(112), unicast(1), fd(10,11)]
Aug 25 15:32:11 192_168_173_203 Keepalived_healthcheckers[8308]: Using LinkWatch kernel netlink reflector...
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Script(pos) succeeded
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Script(nag) succeeded
Aug 25 15:32:11 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Script(zero) succeeded
第一次竞选MASTER成功, 说明Entering后, 脚本执行完后, 动态调整了priority. 现在的优先级是100+3=103
Aug 25 15:32:12 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Instance(vi_1) forcing a new MASTER election
Aug 25 15:32:12 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Instance(vi_1) forcing a new MASTER election
Aug 25 15:32:13 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Instance(vi_1) Transition to MASTER STATE
Aug 25 15:32:14 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Instance(vi_1) Entering MASTER STATE
Aug 25 15:32:14 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Instance(vi_1) setting protocol VIPs.
Aug 25 15:32:14 192_168_173_203 Keepalived_healthcheckers[8308]: Netlink reflector reports IP 172.16.173.100 added
Aug 25 15:32:14 192_168_173_203 Keepalived_vrrp[8309]: VRRP_Instance(vi_1) Sending gratuitous ARPs on eth0 for 172.16.173.100


路由器进入状态后, 动态优先级才会被调整. 没有进入状态前的track都不会影响优先级.

[参考]
1. keepalived src
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