In a real project, Mycat services also need to consider high availability, if Mycat where the server goes down, or Mycat service
Service failure, the need for equipment supplies services, need to be considered Mycat cluster.
1, high availability solutions
Use HAProxy + Keepalived with two Mycat put Mycat clusters for high availability.
HAProxy achieve a multi-node cluster MyCat of
high availability
and
load balancing
HAProxy own high availability can be achieved by Keepalived.
| Roles | ip |
| mycat01 | 192.168.199.217 |
| mycat02 | 192.168.199.120 |
| HA (primary) | 192.168.199.174 |
| keepalive (host) | 192.168.199.174 |
| HA (primary) | 192.168.199.199 |
| keepalive (Host | 192.168.199.199 |
First configured mycat and start mycat
2 installation configuration HAProxy
1, the installation HAProxy
2 to extract the / usr / local / src
3 after entering the decompression directory, core edition, compiled
[root@mycat05 software]# cd /usr/local/src/haproxy-1.5.18/
[root@mycat05 haproxy-1.5.18]# uname -r
3.10.0-957.el7.x86_64
[root@mycat05 haproxy-1.5.18]# make TARGET=linux310 PREFIX=/usr/local/haproxy ARCH=x86_64
# ARGET = linux310, kernel version, use uname -r kernel view, such as: 3.10.0-957.el7, at this time it is the parameter linux310;
# ARCH = x86_64, system-digit;
# PREFIX = / usr / local / haprpxy # / usr / local / haprpxy, as haprpxy installation path.
4 compiled, installed
make install PREFIX=/usr/local/haproxy
After the installation is complete, create a directory, create a profile HAProxy
mkdir -p /usr/data/haproxy/
vim /usr/local/haproxy/haproxy.conf
6 Insert the following configuration information to the configuration file, and save
global log 127.0.0.1 local0 #log 127.0.0.1 local1 notice #log loghost local0 info maxconn 4096 chroot /usr/local/haproxy pidfile /usr/data/haproxy/haproxy.pid uid 99 gid 99 daemon #debug #quiet defaults log global mode tcp option abortonclose option redispatch retries 3 maxconn 2000 timeout connect 5000 timeout client 50000 timeout server 50000 listen proxy_status bind :48066 mode tcp balance roundrobin server mycat_1 192.168.140.128:8066 check inter 10s server mycat_2 192.168.140.127:8066 check inter 10s frontend admin_stats bind :7777 mode http stats enable option httplog maxconn 10 stats refresh 30s stats uri /admin stats auth admin:123123 //登陆账户and密码 stats hide-version stats admin if TRUE
2, boot authentication
1 Start HAProxy
/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.conf
2 View HAProxy process
ps -ef|grep haproxy
3 Open a browser to access
If Mycat standby machine have been activated, as can be seen in FIG.
4 Verify load balancing, access Mycat by HAProxy
Execution (192.168.199.174HA host address) on the host HAProxy
[root@mycat05 haproxy-1.5.18]# mysql -umycat -p123456 -h 192.168.199.174 -P 48066
3 Configuration Keepalived
Download: https://www.keepalived.org/software/
1 Ready Keepalived installation package, reached the / opt directory under
2 to extract the / usr / local / src
tar -zxvf keepalived-1.4.2.tar.gz -C /usr/local/src
3 Installation depends plug
yum install -y gcc openssl-devel popt-devel
4 into the unpacked directory, configure, compile
cd /usr/local/src/keepalived-1.4.2
./configure --prefix=/usr/local/keepalived
5 compiled, installed after the completion of
make && make install
Before running configuration 6
cp /usr/local/src/keepalived-1.4.2/keepalived/etc/init.d/keepalived /etc/init.d/
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/src/keepalived-1.4.2/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
7修改配置文件
vim /etc/keepalived/keepalived.conf
#修改内容如下 ! Configuration File for keepalived global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_garp_interval 0 vrrp_gna_interval 0 } vrrp_instance VI_1 { #主机配MASTER，备机配BACKUP state MASTER #所在机器网卡 interface ens33 virtual_router_id 51 #数值越大优先级越高 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { #虚拟IP 192.168.199.111 } } virtual_server 192.168.199.111 48066 { delay_loop 6 lb_algo rr lb_kind NAT persistence_timeout 50 protocol TCP real_server 192.168.199.174 48066 { # HA的地址（主机） weight 1r TCP_CHECK { connect_timeout 3 retry 3 delay_before_retry 3 } } real_server 192.168.199.199 48600 {#HA地址（备机r） weight 1 TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } }
8、启动Keepalived
同时启动备机上的HA
service keepalived start
9、登录验证
mysql -umycat -p123456 -h 192.168.199.111 -P 48066
192.168.199.111 ：虚拟ip
此时是：
HA隐藏mycat的ip
KeepAlive隐藏HA的ip
4 测试高可用
1关闭mycat
2通过虚拟ip查询数据
mysql -umycat -p123456 -h 192.168.199.111 -P 48066
mysql> select * from orders; ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql> select * from orders; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 2 Current database: TESTDB +--------+------------+-------------+-----------+ | id | order_type | customer_id | amount | +--------+------------+-------------+-----------+ | 1 | 101 | 100 | 100100.00 | | 2 | 101 | 100 | 100300.00 | | 6 | 102 | 100 | 100020.00 | | 3 | 101 | 101 | 120000.00 | | 4 | 101 | 101 | 103000.00 | | 5 | 102 | 101 | 100400.00 | | 400100 | 102 | 101 | 1000.00 | | 400101 | 102 | 101 | 1000.00 | +--------+------------+-------------+-----------+ 8 rows in set (1.46 sec)