keepalived 主從搭建

基本環境：centos7

1、原始碼包安裝

cd /usr/local/src/  #進入到準備放原始檔的目錄
[root@localhost src]# pwd
/usr/local/src
[root@localhost src]# tar xvf keepalived-2.0.18.tar.gz  # 解壓
[root@localhost src]# cd keepalived-2.0.18 #進入到解壓後的目錄
[root@localhost src keepalived-2.0.18]# ./configure --prefix=/usr/local/keepalived  #校驗
[root@localhost src keepalived-2.0.18]# make && make install # 編譯安裝

2、初始化及啟動

[root@localhost /]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/keepalived # 將keepalived主程式加入到環境變數（安裝目錄下） [root@localhost /]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived # keepalived啟動指令碼（原始碼目錄下），放到/etc/init.d/目錄下就可以使用service命令便捷呼叫 [root@localhost /]# cp /usr/local/src/keepalived-2.0.18/keepalived/etc/init.d/keepalived /etc/init.d/keepalived # 將配置檔案放到預設路徑下 [root@localhost /]# mkdir /etc/keepalived [root@localhost /]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf 加為系統服務：chkconfig –add keepalived 開機啟動：chkconfig keepalived on 檢視開機啟動的服務：chkconfig –list

啟動、關閉、重啟service keepalived start|stop|restart

3、keepalived 配置

vim /etc/keepalived/keepalived.conf #配置keepalived.conf ! configuration file for keepalived global_defs vrrp_script check_nginx_status vrrp_instance vi_1 track_script virtual_ipaddress

}

4、檢測指令碼

指令碼邏輯為：先檢測nginx是否在執行，沒有則重啟nginx,等2秒後再檢測一次，如果nginx依舊沒有啟動，則停止keepalived。

指令碼注意開頭一定要有 #!/bin/bash，不然keepalived 執行不起。

#!/bin/bash
counter=$(ps - c nginx --no-heading|wc -l)  
if [ "$" = "0" ]; then
/usr/local/nginx/sbin/nginx
sleep 2
counter=$(ps -c nginx --no-heading|wc -l)
if [ "$" = "0" ]; then
systemctl stop keepalived
fifi

指令碼賦許可權：chmod 755 check_nginx_status.sh

注意給執行許可權 chmod 755, 不能給777。至少root使用者不能給777許可權，安全機制導致不會被keepalived執行

5、配置檔案檢測：

請在v2.0.13及以上版本使用，之前的版本reload兩次後程序會終止，官方已恢復。

/usr/local/keepalived/sbin/keepalived -t

6、問題：

disabling track script check_nginx_status due to insecure

該問題原因為 check_nginx_status.sh 的許可權問題。 root 使用者777 許可權會出現該問題

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