Docker：单机编排工具docker-compose [十二]
一、docker-compose的安装
1、安装
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo yum install -y python2-pip pip install -i https://pypi.tuna.tsinghua.edu.cn/simple docker-compose
2、检查是否安装成功
docker-compose -v
二、docker-compose案例
1、撰写docker-compose.yml文件
[root@luoahong mywordpress]# pwd
/opt/mywordpress
[root@luoahong mywordpress]# ll
total 4
-rw-r--r-- 1 root root 603 Jan 18 10:51 docker-compose.yml
[root@luoahong mywordpress]# cat docker-compose.yml
version: '3'
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: somewordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
volumes:
- web_data:/var/www/html
ports:
- "80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
volumes:
db_data:
web_data:
2、启动容器
[root@luoahong mywordpress]# docker-compose up -d Starting mywordpress_db_1 ... done Starting mywordpress_wordpress_1 ... done [root@luoahong mywordpress]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 7fdb12738746 wordpress:latest "docker-entrypoint.s…" 5 minutes ago Up 11 seconds 0.0.0.0:32769->80/tcp mywordpress_wordpress_1 72e1954332dc mysql:5.7 "docker-entrypoint.s…" 5 minutes ago Up 12 seconds 3306/tcp, 33060/tcp mywordpress_db_1 f82cd0895416 centos:6.9 "/bin/bash" 2 days ago Exited (255) 2 hours ago 0.0.0.0:80->80/tcp gifted_swirles
3、容器启动了什么网络
[root@luoahong mywordpress]# docker network ls NETWORK ID NAME DRIVER SCOPE d766f2526542 bridge bridge local 30b37ec09ff2 host host local ad2616372f01 mywordpress_default bridge local 03062097926d none null local
4、容器启动了什么数据卷
[root@luoahong mywordpress]# docker volume ls DRIVER VOLUME NAME local mywordpress_db_data local mywordpress_web_data
5、动态增加容器
[root@luoahong mywordpress]# docker-compose scale wordpress=3 WARNING: The scale command is deprecated. Use the up command with the --scale flag instead. Starting mywordpress_wordpress_1 ... done Creating mywordpress_wordpress_2 ... done Creating mywordpress_wordpress_3 ... done [root@luoahong mywordpress]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES dc0548d44d4f wordpress:latest "docker-entrypoint.s…" 10 seconds ago Up 6 seconds 0.0.0.0:32771->80/tcp mywordpress_wordpress_3 2ca0fa1916be wordpress:latest "docker-entrypoint.s…" 10 seconds ago Up 6 seconds 0.0.0.0:32770->80/tcp mywordpress_wordpress_2 7fdb12738746 wordpress:latest "docker-entrypoint.s…" 6 minutes ago Up About a minute 0.0.0.0:32769->80/tcp mywordpress_wordpress_1 72e1954332dc mysql:5.7 "docker-entrypoint.s…" 6 minutes ago Up About a minute 3306/tcp, 33060/tcp mywordpress_db_1 f82cd0895416 centos:6.9 "/bin/bash" 2 days ago Exited (255) 2 hours ago 0.0.0.0:80->80/tcp gifted_swirles
6、测试截图
三、docker-compose.yml文件详解
1、全文注解
version: '3'
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql
restart: always #容器重启服务跟着自动重启
environment: #容器的环境变量
MYSQL_ROOT_PASSWORD: somewordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on: #依赖db服务
- db
image: wordpress:latest
volumes: #创建数据圈
- web_data:/var/www/html
ports:
- "80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
volumes:
db_data:
web_data:
2、restart: always的作用
[root@oldboy ~]# docker run -d -p 5000:5000 --restart=always -v /opt/myregistry:/var/lib/registry registry Unable to find image 'registry:latest' locally latest: Pulling from library/registry [root@luoahong2 ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 64842c29c697 registry "/entrypoint.sh /etc…" 28 minutes ago Up 28 minutes 0.0.0.0:5000->5000/tcp heuristic_montalcini [root@luoahong2 ~]# systemctl restart docker [root@luoahong2 ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 64842c29c697 registry "/entrypoint.sh /etc…" 29 minutes ago Up 4 seconds 0.0.0.0:5000->5000/tcp heuristic_montalcini [root@luoahong2 ~]# systemctl restart docker [root@luoahong2 ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 64842c29c697 registry "/entrypoint.sh /etc…" 29 minutes ago Up 1 second 0.0.0.0:5000->5000/tcp heuristic_montalcini
容器重启服务跟着自动重启
四、容器负载均衡搭建测试
1、编写测试文件
root@luoahong mywordpress]# docker volume ls DRIVER VOLUME NAME local mywordpress_db_data local mywordpress_web_data [root@luoahong mywordpress]# cd /var/lib/docker/volumes/mywordpress_web_data/_data/ [root@luoahong _data]# ll total 196 -rw-r--r-- 1 33 33 418 Sep 25 2013 index.php -rw-r--r-- 1 33 33 19935 Jan 7 2018 license.txt -rw-r--r-- 1 33 33 7415 Mar 19 2018 readme.html -rw-r--r-- 1 33 33 6878 Dec 13 09:30 wp-activate.php drwxr-xr-x 9 33 33 4096 Dec 20 07:23 wp-admin -rw-r--r-- 1 33 33 364 Dec 19 2015 wp-blog-header.php -rw-r--r-- 1 33 33 1889 May 3 2018 wp-comments-post.php -rw-r--r-- 1 33 33 3154 Jan 18 11:21 wp-config.php -rw-r--r-- 1 33 33 2764 Jan 18 11:21 wp-config-sample.php drwxr-xr-x 4 33 33 52 Dec 20 07:23 wp-content -rw-r--r-- 1 33 33 3669 Aug 20 2017 wp-cron.php drwxr-xr-x 19 33 33 8192 Dec 20 07:23 wp-includes -rw-r--r-- 1 33 33 2422 Nov 21 2016 wp-links-opml.php -rw-r--r-- 1 33 33 3306 Aug 22 2017 wp-load.php -rw-r--r-- 1 33 33 37296 Dec 13 08:28 wp-login.php -rw-r--r-- 1 33 33 8048 Jan 11 2017 wp-mail.php -rw-r--r-- 1 33 33 17421 Oct 23 15:04 wp-settings.php -rw-r--r-- 1 33 33 30091 Apr 30 2018 wp-signup.php -rw-r--r-- 1 33 33 4620 Oct 24 2017 wp-trackback.php -rw-r--r-- 1 33 33 3065 Sep 1 2016 xmlrpc.php [root@luoahong _data]# pwd /var/lib/docker/volumes/mywordpress_web_data/_data [root@luoahong _data]# oot@luoahong _data]# vim info.php ▽ <?php phpinfo(); ?>
2、部署nginx
[root@luoahong2 ~]# rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm Retrieving http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm warning: /var/tmp/rpm-tmp.CgAfYa: Header V4 RSA/SHA1 Signature, key ID 7bd9bf62: NOKEY Preparing... ################################# [100%] Updating / installing... 1:nginx-release-centos-7-0.el7.ngx ################################# [100%] [root@luoahong2 ~]# yum install nginx -y
3、配置nginx文件
[root@luoahong2 ~]# cat /etc/nginx/nginx.conf
user nginx;
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream wordpress{
server 192.168.231.136:32769;
server 192.168.231.136:32770;
server 192.168.231.136:32771;
}
server{
listen 80;
server_name localhost;
location / {
proxy_pass http://wordpress;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
}
[root@luoahong2 ~]# systemctl restart nginx.service
[root@luoahong2 ~]# netstat -lntup
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 18726/nginx: master
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1163/sshd
tcp6 0 0 :::22 :::* LISTEN 1163/sshd
tcp6 0 0 :::5000 :::* LISTEN 18307/docker-proxy
udp 0 0 0.0.0.0:68 0.0.0.0:* 15813/dhclient
udp 0 0 0.0.0.0:38159 0.0.0.0:* 15813/dhclient
udp 0 0 127.0.0.1:323 0.0.0.0:* 615/chronyd
udp6 0 0 :::26916 :::* 15813/dhclient
udp6 0 0 ::1:323 :::* 615/chronyd
4、容器负载均衡测试截图
作者：罗阿红
出处：http://www.cnblogs.com/luoahong/
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