玩Docker httpd image

1.下載ˇ官方httpd image
 #docker pull httpd
root@k8s02:/container/www1# docker pull httpd
root@k8s02:/container/www1# docker images
REPOSITORY                         TAG                 IMAGE ID            CREATED             SIZE
httpd                              latest              11426a19f1a2        4 weeks ago         178 MB

2.建立並啟動容器
root@k8s02:/container/www1/conf# docker run -p 80:80 -d httpd

3.檢查容器內相關檔案路徑
root@k8s02:/container/www1/conf# docker exec -ti b0659d224641 pwd
/usr/local/apache2

root@k8s02:/container/www1/conf# docker exec -ti b0659d224641 ls
bin  build  cgi-bin  conf  error  htdocs  icons  include  logs  modules

root@k8s02:/container/www1/conf# docker exec -ti b0659d224641 ls /usr/local/apache2/htdocs
index.html
容器中網頁存放在/usr/local/apache2/htdoc中

root@k8s02:/container/www1/conf# docker exec -ti b0659d224641 ls /usr/local/apache2/conf
extra  httpd.conf  magic  mime.types  original

apache設定檔httpd.conf存放在/usr/local/apache2/conf中

4.將相關檔案放在HOST上維護，在做移轉時較方便

在HOST上建立相關目錄

mkdir /container/www1/

mkdir /container/www1/web1
mkdir /container/www1/web2
mkdir /container/www1/web3

mkdir /container/www1/conf

mkdir /container/www1/logs

分別修改3個web的index.html
cd mkdir /container/www1/web1

vi index.html

Hello,web1



(web2 以及web3)

cd /container/www1/conf

將https container的httpd.conf 轉出到HOST上
root@k8s02:/container/www1/conf# docker exec -ti b0659d224641 cat /usr/local/apache2/conf/httpd.conf > httpd.conf


5.建立容器
建立並啟動第一個httpd容器，由HOST的8001port進入
docker run -p 8001:80 -d -v /container/www1/web1/:/usr/local/apache2/htdocs/ -v /container/www1/conf/httpd.conf:/usr/local/apache2/conf/httpd.conf -v /container/www1/logs/:/usr/local/apache2/logs/ --name web1 httpd

瀏覽器網址輸入http://10.88.1.134:8001，即會導到容器1的80 port
瀏覽器顯示Hello,web1

建立並啟動第二個httpd容器，由HOST的8002port進入
docker run -p 8002:80 -d -v /container/www1/web2/:/usr/local/apache2/htdocs/ -v /container/www1/conf/httpd.conf:/usr/local/apache2/conf/httpd.conf -v /container/www1/logs/:/usr/local/apache2/logs/ --name web2 httpd

瀏覽器網址輸入http://10.88.1.134:8002，即會導到容器2的80 port
瀏覽器顯示Hello,web2

建立並啟動第三個httpd容器，由HOST的8003port進入
docker run -p 8003:80 -d -v /container/www1/web3/:/usr/local/apache2/htdocs/ -v /container/www1/conf/httpd.conf:/usr/local/apache2/conf/httpd.conf -v /container/www1/logs/:/usr/local/apache2/logs/ --name web3 httpd

瀏覽器網址輸入http://10.88.1.134:8003，即會導到容器3的80 port
瀏覽器顯示Hello,web3


6.建立HAproxy
查出3個https容器的內部IP
root@k8s02:/container/haproxy17/conf# docker exec -it web1 ip a
ip為 172.17.0.2
root@k8s02:/container/haproxy17/conf# docker exec -it web2 ip a
ip為 172.17.0.3
root@k8s02:/container/haproxy17/conf# docker exec -it web3 ip a
ip為 172.17.0.4

haproxy.cfg設定檔會用到


mkdir /container/haproxy17
cd /container/haproxy17
vi Dockerfile

FROM haproxy:1.7
# 為了要把haproxy.cfg設定檔放在HOST方便修改，所以在容器中刪除原先設定檔再建一個設定檔連結到從HOST掛載的目錄上，建立容器時再將HOST存放haproxy.cfg的路徑掛載到容器中使用
RUN rm -f /usr/local/etc/haproxy/haproxy.cfg
RUN ln -s /usr/local/etc/haproxy/conf/haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg


mkdir conf
cd conf
vi haproxy.cfg

global
    daemon
    maxconn 4096
defaults
    mode http
    timeout connect 5000
    timeout client 5000
    timeout server 5000
frontend main
    bind *:80
    stats uri /haproxy?stats
    mode http
    balance roundrobin
    option httpclose
    option forwardfor
    server web1 172.17.0.2:80 check weight 1 maxconn 50
    server web2 172.17.0.3:80 check weight 1 maxconn 30
    server web1 172.17.0.4:80 check weight 1 maxconn 50
    option redispatch
    retries         3

建立haproxy image
root@k8s02:/container/haproxy17# docker build -t my-haproxy .

建立並啟用haproxy容器
root@k8s02:/container/haproxy17# docker run -d --name my-haproxy -p 80:80 my-haproxy

開啟瀏覽器輸入10.88.1.134，就會輪流顯示web1、web2、web3

查看haproxy status
http://10.88.1.134/haproxy?stats