keepalived踩坑记载

环境

操作系统: CentOS7.9
keepalived: 1.35
master设置

1. cat > /etc/keepalived/keepalived.conf<<'EOF'
2. global_defs {
3.     router_id Nginx1
4. }
5. vrrp_script chk_nginx {
6.     script "/etc/keepalived/check_nginx.sh"
7.     interval 3
8.     weight -3
9. }
10. vrrp_instance VI_1 {
11.     state MASTER
12.     interface enp0s8
13.     virtual_router_id 101
14.     priority 120
15.     advert_int 2
16.     nopreempt
17.     authentication {
18.         auth_type PASS
19.         auth_pass 12333
20.     }
21.     virtual_ipaddress {
22.         192.168.240.6
23.     }
24.     track_script {
25.       chk_nginx
26.     }
27. }
29. EOF

复制代码

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

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backup设置

1. cat > /etc/keepalived/keepalived.conf<<'EOF'
2. global_defs {
3.     router_id Nginx2
4. }
5. vrrp_script chk_nginx {
6.     script "/etc/keepalived/check_nginx.sh"
7.     interval 3
8.     weight -3
9. }
10. vrrp_instance VI_1 {
11.     state BACKUP
12.     interface enp0s8
13.     virtual_router_id 101
14.     priority 119
15.     advert_int 2
16.     nopreempt
17.     authentication {
18.         auth_type PASS
19.         auth_pass 12333
20.     }
21.     virtual_ipaddress {
22.         192.168.240.6
23.     }
24.     track_script {
25.       chk_nginx
26.     }
27. }
29. EOF

复制代码

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

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说明

坑点

• 检测脚本/etc/keepalived/check_nginx.sh第一行肯定不要写#!/bin/bash
  
• 检测脚本/etc/keepalived/check_nginx.sh的退出状态码不起作用，以是只能/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

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