centos 7.2 64位 docker安装lamp环境

1. 删除docker可能有的早期版本

yum remove docker

                  docker-client

                  docker-client-latest

                  docker-common

                  docker-latest

                  docker-latest-logrotate

                  docker-logrotate

                  docker-engine

 2. 安装docker需要的一些依赖

yum install -y yum-utils

  device-mapper-persistent-data

  lvm2

 3. 配置docker的repo以便yum install时能够使用到最新的docker版本image

yum-config-manager

    --add-repo

    https://download.docker.com/linux/centos/docker-ce.repo

 4. 安装docker-ce及cli

yum install docker-ce docker-ce-cli containerd.io

5. 立即启动docker engine并设置开机启动

systemctl start docker

systemctl enable docker 

systemctl list-unit-files | grep enabled  检查确认是否已经开机启动

6. 试运行docker container

docker run hello-world

结果出错，google后发现是kernel不匹配，因为centos7.2的kernel太旧，必须更新kernel

下面将记录如何将centos7.2升级kernel到5.0，以下链接可以供参考：

https://www.tecmint.com/install-upgrade-kernel-version-in-centos-7/

https://www.jianshu.com/p/1261ed6f8399

7.配置repo，并且安装最新的linux kernel(5.0)

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

yum --enablerepo=elrepo-kernel install kernel-ml

8. 将5.0的kernel在centos7.2中配置为开机默认项

/etc/default/grub 中增加一个GRUB_DEFAULT=0 这样就选择最新安装的那个kernel了

grub2-mkconfig -o /boot/grub2/grub.cfg  重新生成kernel配置信息，以便自动应用新安装的kernel

9. 重新启动

10. 如果有必要可以创建一个docker group,并将对应用户名加到这个group中，避免使用root直接操作，提高安全性

groupadd docker

11. 镜像加速：

在/etc/docker/daemon.json文件中添加以下内容，

{

  "registry-mirrors": ["https://etomhx9s.mirror.aliyuncs.com"]

}

 并执行：

sudo systemctl daemon-reload

sudo systemctl restart docker

之后所有对docker官方的镜像都会自动加速使用阿里云的mirror

12. centos安装docker-compose

curl -L "https://github.com/docker/compose/releases/download/1.23.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

chmod +x /usr/local/bin/docker-compose

ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose

13. 安装command-line completion以便使用tab键快速列出可选子命令

请参考页面: https://docs.docker.com/compose/completion/

curl -L https://raw.githubusercontent.com/docker/compose/1.23.2/contrib/completion/bash/docker-compose -o /etc/bash_completion.d/docker-compose

//// trouble shooting:

curl https://raw.githubusercontent.com/docker/docker/master/contrib/check-config.sh > check-config.sh

bash ./check-config.sh

准备工作已经做完，下面需要安裝nginx+php-fpm(7.1)+mysql(5.6.35)+redis的容器了.

思路是:通过docker-compose方式来编排微服务，分别切分为nginx web服务器，nginx使用官方镜像；upstream php-fpm应用服务，php-fpm则基于官方7.1的镜像添加一些扩展安装以及composer安装,

注意php-fpm7.2以上版本往往会出现以下错误"Parameter must be an array or an object that implements Countable"

mysql和redis也直接使用官方镜像起一个微服务即可。其中mysql使用一个volume直接应用已经存在的数据库文件，后续可以考虑使用一个数据卷容器来服务数据

由于众所周知的伟大的墙，给我们苦逼的程序猿带来了太多的麻烦，好在docker公司提供的play-with-docker可以免费提供4G内存的云主机足够我们使用。我们直接在该云主机上使用docker-compose build命令做镜像构建，随后push到docker hub上。最后在国内的主机上docker pull下来镜像并使用docker-compose up -d nginx一下子就把所有服务拉起了！

14. 将我们的docker-compose up -d xxx作为开机启动

a)在/etc/systemd/system目录中创建一个myapp.service文本文件

[Unit]
Description=myappservice
After=docker.service#注意本服务依赖于docker service，而dockerservice又require docker.socket 必须在docker engine起来之后才能执行，docker启动比较慢，需要2分钟左右 
[Service] 
# see man systemd.service 
Type=oneshot 
WorkingDirectory=/yourworkingdirectory 
ExecStart=/yourworkingdirectory/start-all.sh 
RemainAfterExit=true 
ExecStop=/yourworkingdirectory/stop-all.sh 
StandardOutput=journal 
[Install] 
WantedBy=multi-user.target

b)在/yourworkingdirectory中分别创建start-all和stop-all.sh脚本

#!/bin/bash
# This is the stop script
docker-compose up -d xx

#!/bin/bash
# This is the stop script
docker-compose stop

c)将启动和停止脚本赋予执行权限: chmod u+x start-all.sh

d)# systemctl enable yourservice

Created symlink from /etc/systemd/system/multi-user.target.wants/yourservice.service to /etc/systemd/system/yourserivce.service.

搞定！

optional:

你可能希望起一个mysqladmin方便你图形化管理数据库

docker run --name myadmin -d --link dockerdeployconf_mysql_1:mysql --net dockerdeployconf_default -e PMA_HOST=mysql -p 8080:80 phpmyadmin/phpmyadmin

docker-compose.yml

version: '3'
services:
  myapp:

      build:
        context: /pathtoconfig
        dockerfile: Dockerfile-phpfpm

    image: xx/myimage:7.1
    depends_on:
      - mysql
      - redis
    volumes:
      - /pathtophpapp/:/application

  mysql:
    image: mysql:5.6
    environment:
      - MYSQL_ROOT_PASSWORD=yourrootpassword
      - MYSQL_DATABASE=yourdatabase
    volumes:
      - /pathtodatafile/:/var/lib/mysql

  nginx:
    image: nginx
    ports:
      - "80:8000"
    volumes:
      - /pathtoconfig/nginx.conf:/etc/nginx/conf.d/default.conf
      - /pathtophpapp/:/application
    depends_on:
      - myapp
  redis:
    image: redis
    ports:
      - "6379:6379"

dockerfile-phpfpm

FROM php:7.1-fpm
LABEL maintainer="zhang@xx.com"

# Installing dependencies
RUN apt-get update && apt-get install -y 
    build-essential 
    mysql-client 
    libpng-dev 
    libjpeg62-turbo-dev 
    libfreetype6-dev 
    libzip-dev 
    locales 
    zip 
    jpegoptim optipng pngquant gifsicle

# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*

# Installing extensions
RUN docker-php-ext-install pdo_mysql mbstring zip exif pcntl bcmath opcache
RUN docker-php-ext-configure gd --with-gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ --with-png-dir=/usr/include/
RUN docker-php-ext-install gd

# Installing composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

# Setting locales
RUN echo zh_CN.UTF-8 UTF-8 > /etc/locale.gen && locale-gen

# Changing Workdir
WORKDIR /application

nginx.conf

server {
  listen 8000;
  index index.php index.html index.htm;
  root /application/public; # default Laravel's entry point for all requests

  access_log /var/log/nginx/access.log;
  error_log /var/log/nginx/error.log;

  location / {
    # try to serve file directly, fallback to index.php
    try_files $uri /index.php?$args;
  }

  location ~ .php$ {
    fastcgi_index index.php;
    fastcgi_pass myapp:9000; # address of a fastCGI server
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO $fastcgi_https://github.com/rlerdorf/php7dev/issues/48_info;
    include fastcgi_params;
  }
}

 其中需要另外注意的一点是：

php-fpm的log搜集问题:

catch_workers_output = yes

https://github.com/rlerdorf/php7dev/issues/48
https://stackoverflow.com/questions/8677493/php-fpm-doesnt-write-to-error-log