Docker基礎實驗

1. 創建Web集羣

1.1 Web1

• 創建一個Nginx1

docker run -itd --name nginx1 centos /bin/bash
25b814928bb878f8aa2fa0834f60939d43500ca2e84279b1d5b06b5f5a91ccb9

• 進入 Nginx1 容器中
  • 默認 centos 中是一個特別乾淨的環境（啥也沒有）
  • 使用 yum provides 查看需要使用命令由那些安裝包提供並且安裝

yum provides ip
yum provides scp
yum provides netstat

yum -y install iproute openssh-clients net-tools

• 拉取Nginx包

scp [email protected]:/root/nginx-* ./

• 解決 Nginx 依賴關係

 yum -y install pcre* gcc zlib-devel openssl-devel

• 創建運行用戶

useradd -M -s /sbin/nologin nginx

• 安裝Nginx

[root@25b814928bb8 ~]# tar -zxf nginx-1.12.2.tar.gz -C /usr/src/
[root@25b814928bb8 ~]# cd /usr/src/nginx-1.12.2/
[root@25b814928bb8 nginx-1.12.2]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_stub_status_module --with-http_ssl_module --with-pcre && make && make install

​ 如果出現報錯：

-bash: make: command not found

​ 解決方法：

yum -y install make

• 優化路徑

ln -s /usr/local/nginx/sbin/nginx /usr/sbin

• 編寫測試網頁

echo 'This is Nginx1' > /usr/local/nginx/html/index.html

• 啓動

 nginx

• 測試

[root@localhost ~]# curl 172.17.0.5
This is Nginx1

1.2 將 Nginx 打包

docker commit nginx1 nginx2/centos-ssh-nginx:latest
sha256:9e59ccb1785305865474699e1fcb0b2f1b733d8f9d5efb9b47c1d91e75a80d8e

docker commit nginx1 nginx3/centos-ssh-nginx:latest
sha256:846a3c6e9b449a71b45c4572697950e30e54d09eaca2db47770341dd02cbbb67

1.3 運行 Nginx2並對其進行修改

• 運行

[root@localhost ~]# docker run -itd --name nginx2 nginx2/centos-ssh-nginx /bin/bash
15660a29a25717c683171fa08adaeeca23eba328429ece9482f14a523facd80f

• 進入並進行修改
  • IP地址修改
  • 修改測試頁面

[root@localhost ~]# docker exec -it nginx2 /bin/bash
[root@15660a29a257 /]# ip a

 echo 'This is a Nginx2' > /usr/local/nginx/html/index.html

• 啓動Nginx

nginx

1.3 運行 Nginx2並對其進行修改

• 運行

[root@localhost ~]# docker run -itd --name nginx2 nginx2/centos-ssh-nginx /bin/bash
a2f9ecb51596f0bcac3aae425dc7fbdda432068733b6c1ce4e45c115300e3051

• 進入並進行修改
  • IP地址修改
  • 修改測試頁面

[root@localhost ~]# docker exec -it nginx2 /bin/bash
[root@15660a29a257 /]# ip a

 echo 'This is a Nginx3' > /usr/local/nginx/html/index.html

• 啓動Nginx

nginx

1.4 測試

[root@localhost ~]# curl 172.17.0.5
This is Nginx1
[root@localhost ~]# curl 172.17.0.6
This is a Nginx2
[root@localhost ~]# curl 172.17.0.7
This is a Nginx3

2. 本機部署Nginx

• 部署Nginx，實現反向代理，負載均衡

• nginx安裝跳過

• 修改其配置文件

    http {
    upstream nginxservers {
        server 172.17.0.5 weight=1;
        server 172.17.0.6 weight=1;
        server 172.170.0.7 weight=1;
    }

	server {
        location / {
            proxy_pass http://nginxservers;
        }
      }   
    }

• 重啓Nginx

killall nginx
nginx

• 測試

[root@localhost ~]# curl 192.168.116.102
This is Nginx1
[root@localhost ~]# curl 192.168.116.102
This is a Nginx2
[root@localhost ~]# curl 192.168.116.102
This is a Nginx3