keepalived踩坑记录

环境

操作系统: CentOS7.9
keepalived: 1.35

master配置

cat > /etc/keepalived/keepalived.conf<<'EOF'
global_defs {
    router_id Nginx1
}
vrrp_script chk_nginx {
    script "/etc/keepalived/check_nginx.sh"
    interval 3
    weight -3
}
vrrp_instance VI_1 {
    state MASTER
    interface enp0s8 
    virtual_router_id 101
    priority 120
    advert_int 2
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 12333
    }
    virtual_ipaddress {
        192.168.240.6
    }
    track_script {
      chk_nginx 
    }
}

EOF

cat > /etc/keepalived/check_nginx.sh<<'EOF'
B=$(pgrep nginx | wc -l)
if [[ $B -eq 0 ]]; then
    /usr/bin/systemctl stop keepalived
    exit 1
fi
exit 0

EOF

backup配置

cat > /etc/keepalived/keepalived.conf<<'EOF'
global_defs {
    router_id Nginx2
}
vrrp_script chk_nginx {
    script "/etc/keepalived/check_nginx.sh"
    interval 3
    weight -3
}
vrrp_instance VI_1 {
    state BACKUP
    interface enp0s8 
    virtual_router_id 101
    priority 119
    advert_int 2
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 12333
    }
    virtual_ipaddress {
        192.168.240.6
    }
    track_script {
      chk_nginx
    }
}

EOF

cat > /etc/keepalived/check_nginx.sh<<'EOF'
B=$(pgrep nginx | wc -l)
if [[ $B -eq 0 ]]; then
    /usr/bin/systemctl stop keepalived
    exit 1
fi
exit 0

EOF

说明

坑点

1. 检测脚本/etc/keepalived/check_nginx.sh第一行一定不要写#!/bin/bash
2. 检测脚本/etc/keepalived/check_nginx.sh的退出状态码不起作用，所以只能/usr/bin/systemctl stop keepalived

排错参考文档

【Linux】详解shell中source、sh、bash、./执行脚本的区别