接上一篇：企業實戰_20_MyCat使用HAPpoxy對Mycat負載均衡
https://gblfy.blog.csdn.net/article/details/100087884

主機名IP地址角色

mycat	192.168.43.32	MYCAT MYSQL,ZK,Haproxy,Keepalived
node1	192.168.43.104	MYSQL,ZK
node2	192.168.43.217	MYSQL,ZK
node3	192.168.43.172	MYSQL,MYCAT ,Haproxy,Keepalived

文章目錄

• • • • • 一、mycat01 節點
        • • 1. 在線安裝keepalived
          • 2. 獲取網卡名
          • 3. 配置 keepalived.conf
          • 4. 編寫監控腳本
          • 5. 腳本賦予權限
          • 6. 運行腳本
          • 7. 查看腳本狀態
          • 8. 查看虛擬vip
        • 二、mycat02 節點
        • • 2.1. 在線安裝keepalived
          • 2. 獲取網卡名
          • 2.3. 配置 keepalived.conf
          • 2.4. 編寫監控腳本
          • 2.5. 腳本賦予權限
          • 2.6. 運行腳本
          • 2.7. 查看腳本狀態
          • 2.8. 查看虛擬vip
        • 三、vip遷移模擬
        • 3.1. 驗證思路
        • 3.2. keepalived 主節點服務停止掉
        • 3.3. keepalived 從節點驗證
        • 3.4. 重啟啟動主節點keepalived
        • 3.5. 登錄從節點
        • 3.6. 結論

一、mycat01 節點

1. 在線安裝keepalived

#安裝依賴包yum install -y curl gcc openssl-devel libnl3-devel net-snmp-devel#yum安裝軟件yum install -y keepalived

2. 獲取網卡名

# 獲取網卡名，等會用于綁定 ip addr

3. 配置 keepalived.conf

#進入/etc/keepalived/cd /etc/keepalived/#編輯keepalived.confvim keepalived.conf ! Configuration Fileforkeepalived vrrp_script chk_http_port {script"/etc/keepalived/check_haproxy.sh"interval 2weight 2 } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 150 advert_int 1 authentication {auth_type PASSauth_pass 1111 } track_script {chk_http_port } virtual_ipaddress { 192.168.92.127 dev ens33 scope global} }

說明：虛擬vip怎樣獲取的？
自己虛擬機玩耍：自己隨機找一個與本機ip段一致的ip即可，
在公司的話：需要發郵件申請

4. 編寫監控腳本

#創建check_haproxy.sh vim /etc/keepalived/check_haproxy.sh#添加內容 #!/bin/bash STARTHAPROXY="/usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg" #STOPKEEPALIVED="/etc/init.d/keepalived stop" STOPKEEPALIVED="/usr/bin/systemctl stop keepalived" LOGFILE="/var/log/keepalived-haproxy-state.log" echo "[check_haproxy status]" >> $LOGFILE A=`ps -C haproxy --no-header |wc -l` echo "[check_haproxy status]" >> $LOGFILE date >> $LOGFILE if [ $A -eq 0 ];thenecho $STARTHAPROXY >> $LOGFILE$STARTHAPROXY >> $LOGFILE 2>&1sleep 5 fi if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];thenexit 0 elseexit 1 fi

5. 腳本賦予權限

#給這個腳本賦予可執行權限 chmod a+x /etc/keepalived/check_haproxy.sh

6. 運行腳本

# 啟動 keepalived systemctl start keepalived

7. 查看腳本狀態

# 查看 keepalived 狀態 systemctl status keepalived

8. 查看虛擬vip

ip addr

二、mycat02 節點

2.1. 在線安裝keepalived

#安裝依賴包yum install -y curl gcc openssl-devel libnl3-devel net-snmp-devel#yum安裝軟件yum install -y keepalived

2. 獲取網卡名

# 獲取網卡名，等會用于綁定 ip addr

2.3. 配置 keepalived.conf

#進入/etc/keepalived/cd /etc/keepalived/#編輯keepalived.conf，把下面的配置覆蓋掉默認的vim keepalived.conf ! Configuration Fileforkeepalived vrrp_script chk_http_port {script"/etc/keepalived/check_haproxy.sh"interval 2weight 2 } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 120 advert_int 1 authentication {auth_type PASSauth_pass 1111 } track_script {chk_http_port } virtual_ipaddress { 192.168.92.127 dev ens33 scope global} }

2.4. 編寫監控腳本

#創建check_haproxy.sh vim /etc/keepalived/check_haproxy.sh#添加內容 #!/bin/bash STARTHAPROXY="/usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg" #STOPKEEPALIVED="/etc/init.d/keepalived stop" STOPKEEPALIVED="/usr/bin/systemctl stop keepalived" LOGFILE="/var/log/keepalived-haproxy-state.log" echo "[check_haproxy status]" >> $LOGFILE A=`ps -C haproxy --no-header |wc -l` echo "[check_haproxy status]" >> $LOGFILE date >> $LOGFILE if [ $A -eq 0 ];thenecho $STARTHAPROXY >> $LOGFILE$STARTHAPROXY >> $LOGFILE 2>&1sleep 5 fi if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];thenexit 0 elseexit 1 fi

2.5. 腳本賦予權限

#給這個腳本賦予可執行權限 chmod a+x /etc/keepalived/check_haproxy.sh

2.6. 運行腳本

# 啟動 keepalived systemctl start keepalived

2.7. 查看腳本狀態

# 查看 keepalived 狀態 systemctl status keepalived

2.8. 查看虛擬vip

ip addr

發現是沒有虛擬vip，對吧！

說明：
由于我們在keepalived 主節點MASTER配置的權重是150，在keepalived 從節點BACKUP配置的權重是120，因此虛擬vip默認會在權重高的機器上。
什么場景下虛擬vip會遷移到keepalived 從節點BACKUP呢？
當keepalived 主節點宕機之后，虛擬vip就會自動遷移到keepalived的slave節點。

三、vip遷移模擬

3.1. 驗證思路

把帶有虛擬ip的haproxy停止掉，虛擬ip，keepalived就會把虛擬ip轉移到另一臺haproxy機器上，當停止掉的haproxy重啟啟動后，虛擬ip就會轉移回來，因為設置了權重。

3.2. keepalived 主節點服務停止掉

[root@node1 ~]# systemctl stop keepalived [root@node1 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:72:fe:1f brd ff:ff:ff:ff:ff:ffinet 192.168.92.101/24 brd 192.168.92.255 scope global noprefixroute ens33valid_lft forever preferred_lft foreverinet6 fe80::e596:6d50:ebed:be08/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft foreverinet6 fe80::301b:b1b8:4c05:8828/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft foreverinet6 fe80::dec4:912f:fd7f:bbd5/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever [root@node1 ~]#

發現虛擬vip不見了。

3.3. keepalived 從節點驗證

ip addr

發現虛擬vip啟動遷移到了從節點機器上

3.4. 重啟啟動主節點keepalived

[root@node1 ~]# systemctl start keepalived You have new mail in /var/spool/mail/root [root@node1 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether 00:0c:29:72:fe:1f brd ff:ff:ff:ff:ff:ffinet 192.168.92.101/24 brd 192.168.92.255 scope global noprefixroute ens33valid_lft forever preferred_lft foreverinet 192.168.92.127/32 scope global ens33valid_lft forever preferred_lft foreverinet6 fe80::e596:6d50:ebed:be08/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft foreverinet6 fe80::301b:b1b8:4c05:8828/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft foreverinet6 fe80::dec4:912f:fd7f:bbd5/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever [root@node1 ~]#

3.5. 登錄從節點

ip addr

發現虛擬vip自動又遷移了回去

3.6. 結論

由于主節點的keepalived 權重比從節點的keepalived高，因此，當主從服務都正常運行的場景，虛擬vip會在主節點上；當主節點宕機后，虛擬vip會自動遷移到從節點上。

下一篇：企業實戰_22_MyCatSQL攔截
https://gblfy.blog.csdn.net/article/details/100073474

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