启动keepalived后宿主机无法ping通用keepalived，报错：
[root@localhost ~]# ping 172.18.0.15 PING 172.18.0.15 (172.18.0.15) 56(84) bytes of data. From 172.18.0.1 icmp_seq=1 Destination Host Unreachable From 172.18.0.1 icmp_seq=2 Destination Host Unreachable From 172.18.0.1 icmp_seq=3 Destination Host Unreachable From 172.18.0.1 icmp_seq=4 Destination Host Unreachable From 172.18.0.1 icmp_seq=5 Destination Host Unreachable From 172.18.0.1 icmp_seq=6 Destination Host Unreachable
解决方案：
大多数都是我把配置文件没写对，重写配置文件，重启服务；
这里检查能否ping通，需要看服务内你的配置文件写入的ip有没有出现在docker的网卡上，具体方法是：
进入到docker服务内，不是在宿主机上哦，查看配置文件 root@8351443065ea:/etc/keepalived# cat keepalived.conf vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 100 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.18.0.201 } } 如果配置文件信息都是正确的，通过ip a命令会显示如当前docker服务有的网卡 root@ec688a676a07:/# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 17: eth0@if18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default ; 很明显没有我配置文件中的172.18.0.201ip地址，代表配置文件未生效，大多数配置文件错误 停掉keepalived服务重新修改编辑后重启 root@ec688a676a07:/# service keepalived stop [....] Stopping keepalived: keepalived. ok 重启服务 root@ec688a676a07:/# service keepalived start [....] Starting keepalived: keepalived. ok 再次查看docker服务的ip root@ec688a676a07:/# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 17: eth0@if18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default link/ether 02:42:ac:12:00:07 brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet 172.18.0.7/16 scope global eth0 valid_lft forever preferred_lft forever 这里出现了我的配置文件ip地址 inet 172.18.0.201/32 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::42:acff:fe12:7/64 scope link valid_lft forever preferred_lft forever 在服务内直接ping这个ip，发现能ping通，切换宿主机，也能ping通，解决问题 [root@localhost ~]# ping 172.18.0.201 PING 172.18.0.201 (172.18.0.201) 56(84) bytes of data. 64 bytes from 172.18.0.201: icmp_seq=1 ttl=64 time=0.077 ms 64 bytes from 172.18.0.201: icmp_seq=2 ttl=64 time=0.064 ms