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基于Docker部署Tomcat集群、 Nginx負載均衡的問題小結

寫在前面

看完Dokcer相關的書籍，正好有個項目要這樣搞，所以自己練習一下。

當作一百世一樣。這里的道理很明白:我思故我在,既然我存在,就不能裝作不存在。無論如何,我要為自己負起責任。——王小波《三十而立》

結構圖：

這里僅作為一種學習，一般這種負載的話，Nginx是放到主機側的， JavaWeb(Tomcat)應用放到容器里。

效果

新建文件夾。

D=uag;mkdir $D;cd $D;mkdir uag_nginx uag_tomcat8;
 ls
 uag_nginx  uag_tomcat8

一，Ngixn 鏡像制作

cd uag_nginx/
# 用于存放配置文件
mkdir nginx
vim Dockerfile

Dockerfile 文件內容

FROM nginx
LABEL maintainer="uag"
ENV REFRESHED_AT 2021-08-27

EXPOSE 8099

構建nginx配置文件內容

這個的配置文件，在容器運行的時候通過 -v參數與容器內部共享。方便后期參數更改

cd ./nginx
vim nginx.conf

nginx.conf 配置文件內容

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;
daemon off;

events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$upstream_addr - $remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;

    server {
        listen          8099;
        server_name     localhost;

        root            /var/www/html/;
        index           index.html index.htm;

        access_log      /var/log/nginx/default_access.log main;
        error_log       /var/log/nginx/default_error.log;

        
        location / {
                proxy_pass http://backend;
        }

        location ~ .* {
                        proxy_pass http://backend;
                        proxy_set_header Host $http_host;
                        proxy_set_header X-Real-IP $remote_addr;
                        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                }

        

}
    # 這里配置負載 
    upstream backend {
    server 172.23.231.190:8069;
    server 172.23.231.190:8079;
    server 172.23.231.190:8089;
}
}

配置負載:172.23.231.190為宿主機IP,8069,8079,8089為對應的Java Web 暴露的應用端口。

 # 這里配置負載 
    upstream backend {
    server 172.23.231.190:8069;
    server 172.23.231.190:8079;
    server 172.23.231.190:8089;
}

構建Nginx鏡像

docker build -t uag/uag_nginx .

二，java Web(Tomcat)應用鏡像構建

cd uag_tomcat8/

vim Dockerfile

Dockerfile 文件內容

FROM dordoka/tomcat
MAINTAINER LIRUILONG

COPY UAWeb.war   /opt/tomcat/webapps/UAWeb.war

EXPOSE 8080

ENTRYPOINT [ "/opt/tomcat/bin/catalina.sh", "run" ]

上傳對應的War包

ls
Dockerfile  UAWeb.war

構建鏡像

docker build -t uag/uag_tomcat .

三，運行容器 Nginx鏡像

docker run -d -p 8099:8099 --name uag_nginx  -v $PWD/nginx/nginx.conf:/etc/nginx/nginx.conf   uag/uag_nginx nginx

java Web(Tomcat)鏡像

docker run -it -d -p 8089:8080 --name uag_app_1  uag/uag_tomcat
 docker run -it -d -p 8079:8080 --name uag_app_2  uag/uag_tomcat
 docker run -it -d -p 8069:8080 --name uag_app_3  uag/uag_tomcat

查看運行的容器

瀏覽器訪問

查看負載方式:新進程的方式

查看負載方式:–volumes-from 方式

Dockerfile文件

FROM nginx
LABEL maintainer="uag"
ENV REFRESHED_AT 2021-08-27

VOLUME  /var/log/nginx/
EXPOSE 80

┌──(liruilong㉿Liruilong)-[/mnt/e/docker/uag/uag_nginx]
└─$ docker run  -it --rm --volumes-from nginx_log  centos cat /var/log/nginx/default_access.log
172.23.231.190:8069 - 172.17.0.1 - - [30/Aug/2021:12:55:02 +0000] "GET /UAWeb/services/listServices HTTP/1.1" 200 12660 "http://127.0.0.1:8099/UAWeb/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36" "-"

172.23.231.190:8079 - 172.17.0.1 - - [30/Aug/2021:12:55:02 +0000] "GET /UAWeb/axis2-web/css/axis-style.css HTTP/1.1" 200 1587 "http://127.0.0.1:8099/UAWeb/services/listServices" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36" "-"
172.23.231.190:8069 - 172.17.0.1 - - [30/Aug/2021:12:55:02 +0000] "GET /UAWeb/axis2-web/images/asf-logo.gif HTTP/1.1" 200 5866 "http://127.0.0.1:8099/UAWeb/services/listServices" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36" "-"
172.23.231.190:8079 - 172.17.0.1 - - [30/Aug/2021:12:55:02 +0000] "GET /UAWeb/axis2-web/images/axis_l.jpg HTTP/1.1" 200 12340 "http://127.0.0.1:8099/UAWeb/services/listServices" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36" "-"
172.23.231.190:8089 - 172.17.0.1 - - [30/Aug/2021:12:55:03 +0000] "GET /UAWeb/services/listServices HTTP/1.1" 200 12660 "http://127.0.0.1:8099/UAWeb/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36" "-"
172.23.231.190:8069 - 172.17.0.1 - - [30/Aug/2021:12:55:03 +0000] "GET /UAWeb/axis2-web/images/asf-logo.gif HTTP/1.1" 200 5866 "http://127.0.0.1:8099/UAWeb/services/listServices" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92

構建好鏡像上傳倉庫：

嗯，需要注冊一個Docker Hub賬號，然后登錄，需要鏡像前面加 賬戶名/

┌──(liruilong㉿Liruilong)-[/mnt/e/docker/uag/uag_nginx]
└─$ docker push liruilong/nginx_log
The push refers to repository [docker.io/liruilong/nginx_log]
An image does not exist locally with the tag: liruilong/nginx_log

┌──(liruilong㉿Liruilong)-[/mnt/e/docker/uag/uag_nginx]
└─$ docker tag 9c9af0362eb9  liruilong/nginx_log

┌──(liruilong㉿Liruilong)-[/mnt/e/docker/uag/uag_nginx]
└─$ docker push liruilong/nginx_log
The push refers to repository [docker.io/liruilong/nginx_log]
fb04ab8effa8: Pushed
8f736d52032f: Pushed
009f1d338b57: Pushed
678bbd796838: Pushed
d1279c519351: Pushed
f68ef921efae: Pushed
latest: digest: sha256:2af7e8aeab84e8a816caf6b0342e1a45f95c7089ff52578040ea3a4c28a943c7 size: 1570

┌──(liruilong㉿Liruilong)-[/mnt/e/docker/uag/uag_nginx]
└─$  docker push liruilong/nginx_log:tagname  # 拉去鏡像