keepalive 安裝和雙機熱備

2、安裝

#unzip keepalived-master.zip

#cd keepalived-master

或

#tar zxvf keepalived-1.2.7.tar.gz

#cd keepalived-1.2.7

#./configure --prefix=/usr/local/keepalived

或#./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-238.19.1.el5-i686/

（指定kernel 的include路徑，整合lvs時需要）

或#./configure --prefix=/usr/local/keepalived --disable-lvs-syncd --disable-lvs

（如果不需要lvs，砍掉lvs部分）

make && make install

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

chmod +x /etc/init.d/keepalived

chkconfig --add keepalived

chkconfig keepalived on

mkdir /etc/keepalived

ln -s /usr/local/sbin/keepalived /usr/sbin/

3、配置檔案修改

#vi /etc/keepalived/keepalived.conf

global_defs

notification_email_from [email protected]

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id lnmp_node1

}#監控服務.nginx mysql

等

vrrp_script chk_nginx

vrrp_instance lnmp

authentication

virtual_ipaddress

track_script

#lvs 負載均衡

virtual_server 192.168.0.200 80 
}real_server 192.168.0.139 80 
}}

------------------------------------------

4、日誌配置

預設，keeplived也是把預設的日誌寫在messages，

1）.在主從keeplived節點上編譯/etc/sysconfig/keepalived檔案

# vi /etc/sysconfig/keepalived

# options for keepalived. see `keepalived --help' output and keepalived(8) and

# keepalived.conf(5) man pages for a list of all options. here are the most

# common ones :

# --vrrp -p only run with vrrp subsystem.

# --check -c only run with health-checker subsystem.

# --dont-release-vrrp -v dont remove vrrp vips & vroutes on daemon stop.

# --dont-release-ipvs -i dont remove ipvs topology on daemon stop.

# --dump-conf -d dump the configuration data.

# --log-detail -d detailed log messages.

# --log-facility -s 0-7 set local syslog facility (default=log_daemon)

keepalived_options="-d -d -s 0"

##引數解釋都在#注釋裡面

2）. 修改主從節點日誌配置檔案/etc/rsyslog.conf

#vi /etc/rsyslog.conf

加入如下配置：

#keepalived -s 0

local0.* /var/log/keepalived.log

3）.重啟日誌服務

# /etc/init.d/rsyslog restart

4）.檢查/var/log/keepalived.log檔案是否存在

ok，到這裡我們的安裝部分完成，下面我們來看看如何監控服務吧，我們這裡僅僅是監控了網路故障和keepalived本身程序，在網路或者keepalived程序出現問題的時候會切換，但是我的節點a裡面還有很多服務呢，例如nginx，php，mysql程序出問題或高負載的時候相應過慢怎麼辦，怎麼切換的呢，這時就要用到指令碼了，下面我們來看看keepalived是如何控制指令碼來實現對伺服器的監控和切換的

兩台機器都這麼設定，保持 virtual_router_id 和 advert_int 和 authentication 一致，就實現了雙擊熱備

（雙機熱備不需要virtual_server，負載均衡lvs才需要)

出現的問題記錄：

1. 在配好主從備份之後，發現虛擬ip能ping通，但是訪問虛擬ip對應機器上的服務(不是apache或者mysql之類的公用軟體)卻不成功，這是因為要訪問的服務繫結了主機上的乙個實體ip不是inaddr_any位址，所以連線不上。

2.記得設定防火牆和關閉selinux策略

關閉selinux

vi /etc/sysconfig/selinux

修改：selinux=disabled

#setenforce

配置iptables，新增vrrp通訊支援

iptables -a input -p vrrp -j accept

3、機器異常或宕機後

不會重新起效，需要重啟keepalived服務

service keepalived restart

//參考

keepalive 安裝和雙機熱備

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