脚本实现通过ansible-playbook自动化安装Keepalived和配置，主要解决问题如下：
- Keepalived自动化安装；
- keepalived_vrid配置，自动根据vip获取最后一段作为vrid，确保同一网段不会出现vrid冲突导致HA切换失败的问题；
- 自动配置Keepalived；
- HA检测脚本自定义，根据脚本内容，来做redis或nginx或其他软件的双机热备；
- 自动配置vip给Keepalived
- 设置Keepalived开机启动，加入系统服务；
Keepalived安装脚本如下：
1 - name: keepalived install and configuration
2 hosts: "{{ host }}"
3 user: root
4
5 tasks:
6 - name: Create the dir
7 file: path={{ item }} state=directory
8 with_items:
9 - /usr/local/keepalived
10 - /etc/keepalived
11 - /keepalived_install
12
13 - name: install rpm pkgs for Keepalived
14 yum: name={{ item }} state=present
15 with_items:
16 - make
17 - wget
18 - gcc
19 - gcc-c++
20 - openssl
21 - openssl-devel
22 - popt-devel
23 - automake
24 - autoconf
25 - libtool
26 - ipvsadm
27 - popt-devel
28 - popt-static
29 - libnl-devel
30 - libnfnetlink-devel
31 - nmap
32
33 - name: download keepalived
34 get_url: url=http://10.86.87.142/evunsoft/keepalived-1.2.19.tar.gz dest=/keepalived_install
35
36 - name: unarchive keepalived
37 unarchive: src=/keepalived_install/keepalived-1.2.19.tar.gz dest=/keepalived_install copy=no
38
39 - name: compile and install keepalived
40 shell: cd /keepalived_install/keepalived-1.2.19 && ./configure --prefix=/usr/local/keepalived && make && make install
41
42 - name: compile and install keepalived
43 command: "{{ item }}"
44 with_items:
45 - /bin/cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
46 - /bin/cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
47 - /bin/cp /usr/local/keepalived/sbin/keepalived /bin/keepalived
48 - /bin/chmod +x /etc/init.d/keepalived
49 - /sbin/chkconfig --add keepalived
50 - /sbin/chkconfig --level 345 keepalived on
51
52 - name: configure keepalived
53 template: src=/ansible/roles/test/template/keepalived.conf.j2 dest=/etc/keepalived/keepalived.conf
54 notify: restart keepalived
55
56 - name: copy nginx service check scripts to remote host
57 template: src=/ansible/roles/test/template/check_nginx.sh.j2 dest=/usr/local/keepalived/check_nginx.sh mode=0755
58
59 - name: copy vrid config_scripts to remote host
60 template: src=/ansible/roles/test/template/replace_vrid.sh.j2 dest=/tmp/keepalived.sh mode=0755
61
62 - name: modify keepalived_vrid
63 shell: sh /tmp/keepalived.sh
64
65 - name: delete the tmp files.
66 file: path={{ item }} state=absent
67 with_items:
68 - /keepalived_install/keepalived-1.2.19.tar.gz
69 - /keepalived_install/keepalived-1.2.19
70 - /keepalived_install
71 - /tmp/keepalived.sh
72
73 handlers:
74 - name: config vrid
75 shell: bash /tmp/keepalived.sh
76
77 handlers:
78 - name: restart keepalived
79 service: name=keepalived enabled=yes state=restarted
keepalived_install.yml
Keepalived配置模板
1 ! Configuration File for keepalived
2
3 global_defs {
4 router_id Nginx
5 }
6
7 vrrp_script chk_nginx {
8 script "/usr/local/keepalived/check_nginx.sh"
9 interval 2
10 fall 3
11 weight -5
12 rise 1
13 }
14
15 vrrp_instance VI_1 {
16 state BACKUP
17 interface {{ ansible_default_ipv4[‘alias‘] }}
18 virtual_router_id keepalived_vrid
19 priority 90
20 nopreempt
21 advert_int 1
22 authentication {
23 auth_type PASS
24 auth_pass 1111
25 }
26 virtual_ipaddress {
27 {{ nginx_havip }}
28 }
29 track_script {
30 chk_nginx
31 }
32 }
keepalived.conf.j2
NGINX服务检测脚本模板
1 #!/bin/sh
2 # check nginx server status
3
4 # Source Function Library
5 . /etc/init.d/functions
6
7 NGINX="/usr/local/nginx/sbin/nginx"
8 NGINX_CONF="/usr/local/nginx/conf/nginx.conf"
9 NGINX_PID="/usr/local/nginx/logs/nginx.pid"
10 PORT=80
11
12 start_nginx() {
13 daemon $NGINX -c $NGINX_CONF
14 }
15
16 stop_nginx() {
17 killproc -p $NGINX_PID $NGINX -TERM
18 }
19
20 nmap localhost -p $PORT | grep "$PORT/tcp open"
21
22 if [ $? -ne 0 ];then
23 stop_nginx
24 start_nginx
25 sleep 3
26 nmap localhost -p $PORT | grep "$PORT/tcp open"
27 [ $? -ne 0 ] && /etc/init.d/keepalived stop
28 fi
check_nginx.sh.j2
说明：
执行此脚本之前，需要安装nginx。
原文地址：https://www.cnblogs.com/miaocbin/p/9597204.html
时间： 2024-08-05 07:36:41