在实际工作中，新项目上线往往都需要搭建HA，此时我们可以通过ansible的playbook来秒级搭建好一个HA环境，从而解放双手；
此playbook适用于centos6、centos7的keepalived搭建，但是请注意var/main.yml中变量的修改，修改为你自己想的设定的配置；
playbook的目录结构：
[[email protected] roles]# tree keepalived/ keepalived/ ├── files │ ├── check_nginx.sh │ └── notify.sh ├── handles ├── meta ├── tasks │ ├── keepalived_backup.yml │ ├── keepalived_master.yml │ └── main.yml ├── templates │ ├── keepalived_backup.conf.j2 │ └── keepalived_master.conf.j2 └── vars └── main.yml 6 directories, 8 files 文件说明： check_nginx.sh：用于检查nginx是否存活，如果nginx不存活，刚keepalived权重降级20，VIP将发生切换 notify.sh：当VIP切换发生后，邮件通知相关用户 keepalived_master.yml：keepalived MASTER节点的安装任务 keepalived_backup.yml：keepalived BACKUP节点的安装任务 tasks/main.yml：将要执行的任务include在此文件中，并同时指定tags对各安装任务进行区别 keepalived_master.conf.j2：MASTER节点的模板配置文件 keepalived_backup.conf.j2：BACKUP节点的模板配置文件 vars/main.yml：所以变量都定义在此文件中
check_nginx.sh的内容：
#!/bin/bash port=80 nmap localhost -p $port | grep "$port/tcp open" if [ $? -ne 0 ];then exit 10 fi
notify.sh的内容：
#!/bin/bash
VIP=$2
sendmail (){
maillist=(
[email protected]
)
if [ "$1" == "master" ];then
subject="${VIP}'s server keepalived state is translate"
content="`date +'%F %T'`: `hostname`'s state change to master"
for mail in ${maillist[*]};do
echo $content | mail -s "$subject" $mail
done
elif [ "$1" == "backup" ];then
subject="${VIP}'s server keepalived state is translate"
content="`date +'%F %T'`: `hostname`'s state change to backup"
for mail in ${maillist[*]};do
echo $content | mail -s "$subject" $mail
done
fi
}
case "$1" in
master)
sendmail master
;;
backup)
sendmail backup
;;
*)
echo "Usage:$0 master|backup VIP"
;;
esac
keepalived_master.conf.j2模板的配置内容：
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id {{ ROUTE_ID }}
}
vrrp_script chk_nginx {
script "/etc/keepalived/check_nginx.sh"
interval 1
weight -20
}
vrrp_instance VI_1 {
state {{ MASTER }}
interface {{ INTERFACE }}
virtual_router_id {{ VIRTUAL_ROUTE_ID }}
priority {{ PRIOTIRY_MASTER }}
advert_int 1
authentication {
auth_type {{ AUTH_TYPE }}
auth_pass {{ AUTH_PASS }}
}
virtual_ipaddress {
{{ VIRTUAL_IP }}/25
}
track_script {
chk_nginx
}
notify_master "/etc/keepalived/notify.sh master {{ VIRTUAL_IP }}"
notify_backup "/etc/keepalived/notify.sh backup {{ VIRTUAL_IP }}"
}
keepalived_backup.conf.j2模板的配置内容：
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id {{ ROUTE_ID }}
}
vrrp_instance VI_1 {
state {{ BACKUP }}
interface {{ INTERFACE }}
virtual_router_id {{ VIRTUAL_ROUTE_ID }}
priority {{ PRIOTIRY_BACKUP }}
advert_int 1
authentication {
auth_type {{ AUTH_TYPE }}
auth_pass {{ AUTH_PASS }}
}
virtual_ipaddress {
{{ VIRTUAL_IP }}/25
}
notify_master "/etc/keepalived/notify.sh master {{ VIRTUAL_IP }}"
notify_backup "/etc/keepalived/notify.sh backup {{ VIRTUAL_IP }}"
}
vars/main.yml变量的内容：
--- MASTER: "MASTER" BACKUP: "BACKUP" PRIOTIRY_MASTER: "100" PRIOTIRY_BACKUP: "90" VIRTUAL_ROUTE_ID: "80" VIRTUAL_IP: "10.10.5.99" AUTH_TYPE: "pass" AUTH_PASS: "111111" ROUTE_ID: "TEST" INTERFACE: "ens160"
keepalived_master.yml任务的内容：
---
- name: "安装keepalived"
yum:
name: keepalived
state: present
- name: "复制检测、通知脚本"
copy:
src={{ item }}
dest=/etc/keepalived/
mode=755
with_items:
- check_nginx.sh
- notify.sh
- name: "复制配置文件"
template:
src=keepalived_master.conf.j2
dest=/etc/keepalived/keepalived.conf
- name: "配置keepalived日志格式"
lineinfile:
path: /etc/sysconfig/keepalived
regexp: 'KEEPALIVED_OPTIONS="-D"'
line: 'KEEPALIVED_OPTIONS="-D -S 3"'
backrefs: no
- name: "创建日志目录"
file:
path: /var/log/keepalived
state: directory
- name: "配置rsyslog中关于keepalived的"
lineinfile:
path: /etc/rsyslog.conf
insertafter: 'local7.* /var/log/boot.log'
line: 'local3.* /var/log/keepalived/keepalived.log'
- name: "配置日志的udp"
lineinfile:
path: /etc/rsyslog.conf
insertafter: 'UDPServerRun 514'
line: '$ModLoad imudp'
- name: "配置日志的udp"
lineinfile:
path: /etc/rsyslog.conf
insertafter: 'UDPServerRun 514'
line: '$UDPServerRun 514'
- name: "重启日志"
service:
name=rsyslog
state=restarted
- name: "启动keepalived,设置开机自动启动"
service:
name=keepalived
state=started
enabled=yes
keepalived_backup.yml任务的内容：
---
- name: "安装keepalived"
yum:
name: keepalived
state: present
- name: "复制检测、通知脚本"
copy:
src={{ item }}
dest=/etc/keepalived/
mode=755
with_items:
- notify.sh
- name: "复制配置文件"
template:
src=keepalived_backup.conf.j2
dest=/etc/keepalived/keepalived.conf
- name: "配置keepalived日志格式"
lineinfile:
path: /etc/sysconfig/keepalived
regexp: 'KEEPALIVED_OPTIONS="-D"'
line: 'KEEPALIVED_OPTIONS="-D -S 3"'
backrefs: no
- name: "创建日志目录"
file:
path: /var/log/keepalived
state: directory
- name: "配置rsyslog中关于keepalived的"
lineinfile:
path: /etc/rsyslog.conf
insertafter: 'local7.* /var/log/boot.log'
line: 'local3.* /var/log/keepalived/keepalived.log'
- name: "配置日志的udp"
lineinfile:
path: /etc/rsyslog.conf
insertafter: 'UDPServerRun 514'
line: '$ModLoad imudp'
- name: "配置日志的udp"
lineinfile:
path: /etc/rsyslog.conf
insertafter: 'UDPServerRun 514'
line: '$UDPServerRun 514'
- name: "重启日志"
service:
name=rsyslog
state=restarted
- name: "启动keepalived,设置开机自动启动"
service:
name=keepalived
state=started
enabled=yes
tasks/main.yml内容：
--- - include: keepalived_master.yml tags: master - include: keepalived_backup.yml tags: backup
如何执行安装：
MASTER安装命令：ansible-playbook keepalived.yml --tags master
BACKUP安装命令：ansible-playbook keepalived.yml --tags backup
原文地址：http://blog.51cto.com/liuzhengwei521/2103000
时间： 2024-10-10 04:40:18