Docker basic instructions:
Update software package
yum -y update
Install docker virtual machine (centos 7)
yum install -y docker
Run, restart, and shut down docker Virtual machine
service docker start service docker stop
Search image
docker search 镜像名称
Download image
docker pull 镜像名称
View image
docker images
Delete image
docker rmi 镜像名称
Run container
docker run 启动参数 镜像名称
View the container list
docker ps -a
When we want to use the java environment, we can do this:
搜索: [root@vm_71_225_centos ~]# docker search java index name description stars official automated docker.io docker.io/node node.js is a javascript-based platform for... 5752 [ok] docker.io docker.io/tomcat apache tomcat is an open source implementa... 1891 [ok] docker.io docker.io/java java is a concurrent, class-based, and obj... 1745 [ok] docker.io docker.io/openjdk openjdk is an open-source implementation o... 1031 [ok]
下载: [root@vm_71_225_centos ~]# docker pull docker.io/java using default tag: latest trying to pull repository docker.io/library/java ... latest: pulling from docker.io/library/java 5040bd298390: downloading [=> ] 1.572 mb/51.36 mb
运行: [root@vm_71_225_centos ~]# docker run -it --name myjava docker.io/java bash root@25623e12b759:/# java -i: 以交互模式运行容器,通常与 -t 同时使用; -t: 为容器重新分配一个伪输入终端,通常与 -i 同时使用;
Install the pxc cluster (no mysql pxc cluster and replication here) The advantages and disadvantages of the cluster solution are explained. Here we choose the pxc cluster solution [multi-node backup and strong federation]):
Install the pxc image
docker pull percona/percona-xtradb-cluster
View the local image
[root@vm_71_225_centos ~]# docker images repository tag image id created size docker.io/hello-world latest e38bc07ac18e 2 months ago 1.85 kb docker.io/percona/percona-xtradb-cluster latest f1439de62087 3 months ago 413 mb docker.io/java latest d23bdf5b1b1b 17 months ago 643 mb
docker.io/percona/percona-xtradb-cluster is too long, change the name:
[root@vm_71_225_centos ~]# docker tag percona/percona-xtradb-cluster pxc [root@vm_71_225_centos ~]# docker images repository tag image id created size docker.io/hello-world latest e38bc07ac18e 2 months ago 1.85 kb docker.io/percona/percona-xtradb-cluster latest f1439de62087 3 months ago 413 mb pxc latest f1439de62087 3 months ago 413 mb docker.io/java latest d23bdf5b1b1b 17 months ago 643 mb
Create net1 network segment:
docker network create --subnet=172.18.0.0/16 net1
Create five data volumes (pxc cannot be accessed directly The data of the host group machine, so create five docker data volumes)
docker volume create v1 docker volume create v2 docker volume create v3 docker volume create v4 docker volume create v5
Check the data volume location:
[root@vm_71_225_centos code]# docker inspect v1 [ { "driver": "local", "labels": {}, "mountpoint": "/var/lib/docker/volumes/v1/_data", "name": "v1", "options": {}, "scope": "local" } ]
Create a 5-node pxc cluster
#创建第1个mysql节点 docker run -d -p 3306:3306 -e mysql_root_password=abc123456 -e cluster_name=pxc -e xtrabackup_password=abc123456 -v v1:/var/lib/mysql -v backup:/data --privileged --name=node1 --net=net1 --ip 172.18.0.2 pxc
Wait for 2 minutes , then create a second node, and wait until the first node is instantiated before opening the second node instance, otherwise it will stop instantly
Create other nodes:
#创建第2个mysql节点 docker run -d -p 3307:3306 -e mysql_root_password=abc123456 -e cluster_name=pxc -e xtrabackup_password=abc123456 -e cluster_join=node1 -v v2:/var/lib/mysql -v backup:/data --privileged --name=node2 --net=net1 --ip 172.18.0.3 pxc #创建第3个mysql节点 docker run -d -p 3308:3306 -e mysql_root_password=abc123456 -e cluster_name=pxc -e xtrabackup_password=abc123456 -e cluster_join=node1 -v v3:/var/lib/mysql --privileged --name=node3 --net=net1 --ip 172.18.0.4 pxc #创建第4个mysql节点 docker run -d -p 3309:3306 -e mysql_root_password=abc123456 -e cluster_name=pxc -e xtrabackup_password=abc123456 -e cluster_join=node1 -v v4:/var/lib/mysql --privileged --name=node4 --net=net1 --ip 172.18.0.5 pxc #创建第5个mysql节点 docker run -d -p 3310:3306 -e mysql_root_password=abc123456 -e cluster_name=pxc -e xtrabackup_password=abc123456 -e cluster_join=node1 -v v5:/var/lib/mysql -v backup:/data --privileged --name=node5 --net=net1 --ip 172.18.0.6 pxc
Test at any time Mysql node creates a database:
mysql -h 172.18.0.3 -uroot -pabc123456 mysql> create database test; query ok, 1 row affected (0.03 sec)
Log in to other node databases and you can see that synchronization has been carried out to form a simple mysql cluster
Install haproxy for high availability and load balancing
Pull haproxy
docker pull haproxy
Write haproxy configuration file
vi /home/soft/haproxy.cfg
The configuration file is as follows:
global #工作目录 chroot /usr/local/etc/haproxy #日志文件,使用rsyslog服务中local5日志设备(/var/log/local5),等级info log 127.0.0.1 local5 info #守护进程运行 daemon defaults log global mode http #日志格式 option httplog #日志中不记录负载均衡的心跳检测记录 option dontlognull #连接超时(毫秒) timeout connect 5000 #客户端超时(毫秒) timeout client 50000 #服务器超时(毫秒) timeout server 50000 #监控界面 listen admin_stats #监控界面的访问的ip和端口 bind 0.0.0.0:8888 #访问协议 mode http #uri相对地址 stats uri /dbs #统计报告格式 stats realm global\ statistics #登陆帐户信息 stats auth admin:abc123456 #数据库负载均衡 listen proxy-mysql #访问的ip和端口 bind 0.0.0.0:3306 #网络协议 mode tcp #负载均衡算法(轮询算法) #轮询算法:roundrobin #权重算法:static-rr #最少连接算法:leastconn #请求源ip算法:source balance roundrobin #日志格式 option tcplog #在mysql中创建一个没有权限的haproxy用户,密码为空。haproxy使用这个账户对mysql数据库心跳检测 option mysql-check user haproxy server mysql_1 172.18.0.2:3306 check weight 1 maxconn 2000 server mysql_2 172.18.0.3:3306 check weight 1 maxconn 2000 server mysql_3 172.18.0.4:3306 check weight 1 maxconn 2000 server mysql_4 172.18.0.5:3306 check weight 1 maxconn 2000 server mysql_5 172.18.0.6:3306 check weight 1 maxconn 2000 #使用keepalive检测死链 option tcpka
Create the first haproxy load balancing server
Copy code The code is as follows:
docker run -it -d -p 4001:8888 -p 4002:3306 -v /home/soft/haproxy:/usr/local/etc/haproxy --name h1 --privileged --net=net1 --ip 172.18.0.7 haproxy
Enter the h1 container and start haproxy
docker exec -it h1 bash haproxy -f /usr/local/etc/haproxy/haproxy.cfg
Check whether the startup is successful:
Visit http:// ip:4001/dbs
Install keepalive to achieve double-click hot backup
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