用docker升级站点环境
该项目中有的插件需要PHP7的支持，而目前服务器的PHP版本是5.6，导致部分功能不能正常使用。服务器除了运行当前这个项目外，还运行有多个其它项目。如果直接升级服务器上的PHP版本，又担心升级后对其它运行的项目造成影响，而且升级PHP版本还会造成其它所有项目的访问受到影响。新购一台服务器，成本又太高。所以先尝试一下在服务器上搭建docker环境，在docker中运行PHP7然后将项目由docker中的PHP7运行。
目前服务器系统：CentOS 7
先安装docker
yum update
yum install -y docker
yum install -y docker-compose查看安装结果
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# docker-compose -v
docker-compose version 1.18.0, build 8dd22a9
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# docker -v
Docker version 1.13.1, build b2f74b2/1.13.1在服务器上配置之前，我先在本机做一下测试：
在项目中创建一个文件夹docker，并往dokcer里添加一个文件Dockerfile用于创建php7镜像
FROM php:7.1.27-fpm-alpine3.8
MAINTAINER seven <82294148@qq.com>
RUN apk add --no-cache freetype libpng libjpeg-turbo \
freetype-dev libpng-dev libjpeg-turbo-dev && \
docker-php-ext-configure gd \
--with-gd \
--with-freetype-dir=/usr/include/ \
--with-png-dir=/usr/include/ \
--with-jpeg-dir=/usr/include/ && \
NPROC=$(grep -c ^processor /proc/cpuinfo 2>/dev/null || 1) && \
docker-php-ext-install -j${NPROC} gd && docker-php-ext-enable gd && apk del \
freetype-dev libpng-dev libjpeg-turbo-dev && \
apk add gettext-dev \
&& /usr/local/bin/docker-php-ext-install gettext pdo pdo_mysql opcache mysqli dba\
&& apk add --no-cache\
autoconf \
file \
g++ \
gcc \
libc-dev \
make \
pkgconf \
re2c \
zlib-dev \
libmemcached-dev && \
cd /tmp && \
wget https://github.com/php-memcached-dev/php-memcached/archive/php7.zip && \
unzip php7.zip && \
cd php-memcached-php7 && \
phpize || return 1 && \
./configure --prefix=/usr --disable-memcached-sasl --with-php-config=php-config || return 1 && \
make || return 1 && \
make INSTALL_ROOT="" install || return 1 && \
install -d "/etc/php7/conf.d" || return 1 && \
echo "extension=memcached.so" > /etc/php7/conf.d/20_memcached.ini && \
cd /tmp && rm -rf php-memcached-php7 && rm php7.zip && \
docker-php-ext-enable memcached &&\
cd /tmp \
&& wget https://github.com/igbinary/igbinary/archive/2.0.4.zip \
&& unzip 2.0.4.zip && cd igbinary-2.0.4 \
&& phpize && ./configure --with-php-config=php-config \
&& make && make install \
&& echo extension=igbinary.so >> /etc/php7/conf.d/01_igbinary.ini &&\
wget https://github.com/phpredis/phpredis/archive/3.1.2.zip \
&& unzip 3.1.2.zip && cd phpredis-3.1.2 \
&& phpize && ./configure --enable-redis-igbinary --with-php-config=php-config \
&& make && make install \
&& echo extension=redis.so >> /etc/php7/conf.d/01_redis.ini && \
docker-php-ext-enable igbinary redis && apk del autoconf \
file \
g++ \
gcc \
libc-dev \
make \
pkgconf \
re2c \
zlib-dev再在项目目录下创建一个docker-compose.yml，写入启动配置参数
version: '3'
networks:
host:
services:
php7:
build: docker
networks:
- host
ports:
- "9007:9000"
container_name: php7
volumes:
- $PWD:/var/www现在用bash进入项目目录，使用如下命令启动docker
docker-compose up项目启动起来了
wenqidongdeMBP:blog wenqidong$ docker-compose up
Recreating php7 ... done
Attaching to php7
php7 | [18-Apr-2019 02:32:41] NOTICE: fpm is running, pid 1
php7 | [18-Apr-2019 02:32:41] NOTICE: ready to handle connections
php7 | 172.23.0.1 - 18/Apr/2019:02:32:48 +0000 "GET /index.php" 500现在只是添加了一个PHP运行环境，接下来我把本机的nginx配置改一下。主要是配置一下root和fastcgi_pass的地址端口号
location ~ \.php {
#root /usr/share/nginx/present/public;
root /var/www/web;
fastcgi_pass 127.0.0.1:9007;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
fastcgi_split_path_info ^(.+\.php)(.*)$; #添加
fastcgi_param PATH_INFO $fastcgi_path_info; #添加
fastcgi_param RUN_ENV 'dev';
fastcgi_connect_timeout 180;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
client_max_body_size 100m;
client_body_buffer_size 8m;
#client_header_buffer_size 128k;
#large_client_header_buffers 4 128k;
}改好之后，重启一下nginx
nginx -s reload访问一下本地域名，可以看到页面response header中的PHP版本确实是docker中的php7.1.27。但是，好像连接不到数据库。。。
百度一阵猛搜没有找到实际解决方法，csdn记录的答案完全行不通，而且很多解决方式，一看就知道是错误的〜
虽然，知道使用docker时数据库也用docker比较好，但是docker连接宿主机上的数据库这种需求总还是会有，有这种需求，就应该有解决方式，于是上google找找答案..找到了如下回复：
Edit: If you are using Docker-for-mac or Docker-for-Windows 18.03+, just connect to your mysql service using the host host.docker.internal. Use --network="host" in your docker run command, then 127.0.0.1 in your docker container will point to your docker host.
Note: This mode only works on Docker for Linux, per the documentation. https://docs.docker.com/network/host/
- 意思是说，如果在Mac或是Windows上要连接宿主机，如果把host.docker.internal作为数据库的host
- 设置network="host"就可以使用127.0.0.1连接宿主机这种方式，只适用于linux系统。。。国内搜到的答案基本都是设置host，但我测试就是行不通，原来是系统问题.
修改代码中数据库host
'driver' => 'mysql',
'host' => 'host.docker.internal',
'database' => 'blog',
'username' => 'dev',
'password' => '',
'charset' => 'utf8',
'collation' => 'utf8_general_ci',
'prefix' => 'w_',
'port' => '3306'保存，重新访问。欧啦:) !
本地测试好像是可以了，现在push到服务器上试一下
进入服务器项目文件夹, 执行docker-compose up -d，以后台方式启动试一下。
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# docker-compose up -d
ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?
If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.
嗯，报错了，docker服务还没有行运起来，先启动一下docker服务，然后再执行上面的命令
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# systemctl start docker
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# docker-compose up -d
Creating network "blog_host" with the default driver
Building php7
Step 1/3 : FROM php:7.1.27-fpm-alpine3.8
Trying to pull repository docker.io/library/php ...
7.1.27-fpm-alpine3.8: Pulling from docker.io/library/php
c87736221ed0: Pull complete
bcb58026c06e: Pull complete
6c24eee1bf47: Pull complete
864f09cef0fe: Pull complete
...
---> Running in 7d9a35e193a7
nsenter: could not ensure we are a cloned binary: Function not implemented
container_linux.go:247: starting container process caused "process_linux.go:245: running exec setns process for init caused \"exit status 17\""
ERROR: Service 'php7' failed to build: oci runtime error: container_linux.go:247: starting container process caused "process_linux.go:245: running exec setns process for init caused \"exit status 17\""执行到一半又报错了 :(
先看一下已安装的情况
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
<none> <none> 35f3e56d236e 4 minutes ago 68.2 MB
docker.io/php 7.1.27-fpm-alpine3.8 45297c976686 5 weeks ago 68.2 MB
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7d9a35e193a7 35f3e56d236e "/bin/sh -c 'apk a..." About a minute ago Created lucid_kare
d196c5f4f2e8 35f3e56d236e "/bin/sh -c 'apk a..." 5 minutes ago Created epic_cray
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# PHP的基础镜像已经拉下来了，我的PHP镜像是在基础镜像的基础上，再安装一个我需要用的到PHP扩展。这里好像是构建我自定义扩展出错了。:(
据github问题返馈情况，这个似乎是一个跟系统相关的bug，我该如何是好:(
- 想到一个方法，把Dockerfile提交到阿里云的容器服务中，先在阿里云中创建镜像，再到服务器上拉取镜像到服务器本地。启动docker的docker-compose.yml中设置使用本地镜像启动.
已在阿里云容器服务中创建好了镜像
现在来拉镜像到服务器本地
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# sudo docker login --username=茵科美信 registry.cn-shenzhen.aliyuncs.com
Password:
Login Succeeded
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# sudo docker pull registry.cn-shenzhen.aliyuncs.com/swooledo/php7:1.0
Trying to pull repository registry.cn-shenzhen.aliyuncs.com/swooledo/php7 ...
1.0: Pulling from registry.cn-shenzhen.aliyuncs.com/swooledo/php7
c87736221ed0: Already exists
bcb58026c06e: Already exists
6c24eee1bf47: Already exists
864f09cef0fe: Already exists
ba0720ee9bda: Already exists
453e0280f68b: Already exists
a34a71013a6a: Already exists
5f68710aa59c: Already exists
428d22454494: Already exists
579646151b34: Pull complete
Digest: sha256:c399744917c7d664d17825763bcc966eb6f4ddb547402202adfe4b861a91f5eb
Status: Downloaded newer image for registry.cn-shenzhen.aliyuncs.com/swooledo/php7:1.0
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# 查看一下
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
registry.cn-shenzhen.aliyuncs.com/swooledo/php7 1.0 0e1e7058bf18 4 minutes ago 99.9 MB
<none> <none> 35f3e56d236e 43 minutes ago 68.2 MB
docker.io/php 7.1.27-fpm-alpine3.8 45297c976686 5 weeks ago 68.2 MB
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# 镜像已经拉取下来了，名字太长，对镜像做一下重命名
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# docker tag 0e1e7058bf18 blog_php7:latest
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
blog_php7 latest 0e1e7058bf18 7 minutes ago 99.9 MB
registry.cn-shenzhen.aliyuncs.com/swooledo/php7 1.0 0e1e7058bf18 7 minutes ago 99.9 MB
<none> <none> 35f3e56d236e 46 minutes ago 68.2 MB
docker.io/php 7.1.27-fpm-alpine3.8 45297c976686 5 weeks ago 68.2 MB
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# docker rmi 0e1e7058bf18
Error response from daemon: conflict: unable to delete 0e1e7058bf18 (must be forced) - image is referenced in multiple repositories
[root@iZwz9bb1rjtnkht5zwpln3Z ~]# 这里，我把名称改为了 blog_php7 ,使用latest作为tag。 我偿试了一下删除名称比较长的那个镜像，这里显示是不是能删除。
先不管这个了，先改docker-compose.yml试一下能不能启动php7吧...
[root@iZwz9bb1rjtnkht5zwpln3Z blog]# docker-compose up -d
Creating php7 ... error
ERROR: for php7 Cannot start service php7: oci runtime error: container_linux.go:247: starting container process caused "process_linux.go:245: running exec setns process for init caused \"exit status 17\""
ERROR: for php7 Cannot start service php7: oci runtime error: container_linux.go:247: starting container process caused "process_linux.go:245: running exec setns process for init caused \"exit status 17\""
ERROR: Encountered errors while bringing up the project.还是启动不起来 :(
网上还是说是由于linux内核与docker不匹配造成的, 在CentOS7.4上不能有这个问题。因为当前服务器的版本是Centos7.0。还有一台服务器的版本是CentOS7.4，于是在另外一台服务器上试了一下。竟然可以运行!!