docker创建lnmp镜像
docker是一个轻量级的虚拟化技术，而lnmp是一个强大、开源的web运行环境，这里我们就演示用Docker来构建一个lnmp镜像。
PS：为了保持轻量化和可伸缩，Docker鼓励我们 “one process per container”，也就是不要在一个镜像中集成太多的功能，我们这里主要是为了学习研究，所以违背了这个准则，更好的方案是Nginx、Mysql、PHP各自创建镜像，在单独的容器里运行，然后通过容器间的互联实现通信。
1、拉取官方的 centos:6.9 作为基础镜像，安装好基础环境
[root@localhost ~]# docker pull centos:6.9
6.9: Pulling from centos
055b9989266a: Pull complete
f1070d829305: Pull complete
e071bce628ba: Pull complete
Digest: sha256:e7bdc458659b6e644ae85694f2baaf3727c06ad82186fca80f4e3a8e88907cc3
Status: Downloaded newer image for centos:6.9
[root@localhost ~]#
[root@localhost ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
httpd 2.4.29 91199e851c7a 4 weeks ago 177.3 MB
centos 6.9 e071bce628ba 4 weeks ago 194.7 MB
ubuntu 14.04 b44ce450cb60 11 weeks ago 188 MB
[root@localhost ~]#
[root@localhost ~]# docker run -it centos:6.9 /bin/bash
[root@df040eea8088 /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root sbin selinux srv sys tmp usr var
[root@localhost ~]#
[root@df040eea8088 /]# yum install -y epel-release
.......2、安装PHP
[root@df040eea8088 /]# yum install -y php php-fpm php-mysql
.........
.........
[root@df040eea8088 /]# php -v
PHP 5.3.3 (cli) (built: Mar 22 2017 12:27:09)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
[root@df040eea8088 /]# php-fpm -v
PHP 5.3.3 (fpm-fcgi) (built: Mar 22 2017 12:28:05)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
[root@df040eea8088 /]#
[root@df040eea8088 /]# php -m
[PHP Modules]
bz2
calendar
Core
ctype
curl
date
ereg
exif
fileinfo
filter
ftp
gettext
gmp
hash
iconv
json
libxml
mysql
mysqli
openssl
pcntl
pcre
PDO
pdo_mysql
pdo_sqlite
Phar
readline
Reflection
session
shmop
SimpleXML
sockets
SPL
sqlite3
standard
tokenizer
xml
zip
zlib
[Zend Modules]
[root@df040eea8088 /]# yum install -y nginx
.......
配置Nginx以支持PHP，修改 /etc/nginx/conf.d/default.conf 如下：
#
# The default server
#
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name _;
root /www; #change document_root to /www
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
location / {
}
#support php access
location ~ .*\.php$ {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
创建 /www 目录，并且修改用户和用户组为 apache （php-fpm默认运行用户和组为apache）
[root@df040eea8088 /]# mkdir /www
[root@df040eea8088 /]# chown apache:apache /www
[root@df040eea8088 /]# ll / | grep www
drwxr-xr-x. 2 apache apache 4096 Dec 4 08:21 www[root@df040eea8088 /]# yum install -y mysql mysql-server
......
......
[root@df040eea8088 /]# /etc/init.d/mysqld start
Starting mysqld: [ OK ]
[root@df040eea8088 /]# /usr/bin/mysqladmin -u root password '123456'
[root@df040eea8088 /]# /etc/init.d/mysqld stop
Stopping mysqld: [ OK ]5、编写启动命令
[root@df040eea8088 /]# touch /bin/startup.sh
[root@df040eea8088 /]# chmod +x /bin/startup.sh
然后向startup.sh写入如下内容：
#!/bin/sh
/etc/init.d/mysqld start
/etc/init.d/php-fpm start
/etc/init.d/nginx start
#dead loop
while ((1))
do
sleep 1h
done
6、清理不再需要的数据以缩减镜像的尺寸，然后docker commit生成新镜像
[root@df040eea8088 /]# yum remove -y epel-release
[root@df040eea8088 /]# yum clean all
Loaded plugins: fastestmirror, ovl
Cleaning repos: base extras updates
Cleaning up Everything
Cleaning up list of fastest mirrors
[root@df040eea8088 /]# exit
exit
[root@localhost ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
df040eea8088 centos:6.9 "/bin/bash" 2 hours ago Exited (0) 31 seconds ago sleepy_yalow
[root@localhost ~]# docker commit df0 centos:lnmp
efa371fe9b0ede828fe1999e7831491d1dd24cda26f1a27092a9565f4c781e06
[root@localhost ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos lnmp efa371fe9b0e 57 seconds ago 453.4 MB
httpd 2.4.29 91199e851c7a 4 weeks ago 177.3 MB
centos 6.9 e071bce628ba 4 weeks ago 194.7 MB
ubuntu 14.04 b44ce450cb60 11 weeks ago 188 MB
7、测试镜像，启动容器
[root@localhost ~]# docker run -d -p 8848:80 -v /www:/www centos:lnmp /bin/startup.sh
[root@localhost www]# cd /www
[root@localhost www]# echo " index.php
[root@localhost www]# cat index.php
再测试mysql是否正常
[root@localhost www]# touch /www/db.php
代码内容：
connect_errno)
{
die("连接数据库失败". $db->connect_error);
}
echo "连接成功";
$db->close();
访问 127.0.0.1:8848/db.php
[root@localhost www]# curl '127.0.0.1:8848/db.php'
连接成功[root@localhost www]#
That's it ^^