keepalived停掉后，发现状态依然是running
查看keepalived的启动service文件systemctl cat keepalived
内容如下：
# /usr/lib/systemd/system/keepalived.service
Description=LVS and VRRP High Availability Monitor
After=syslog.target network-online.target
Type=forking
PIDFile=/var/run/keepalived.pid
KillMode=process
EnvironmentFile=-/etc/sysconfig/keepalived
ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS
ExecReload=/bin/kill -HUP $MAINPID
WantedBy=multi-user.target
把这一行（KillMode=process）注释掉即可，这行目前只会停止主进程而不会关闭子进程，所以才会出现这个情况
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