基于Docker如何部署Tomcat集群、 Nginx负载均衡

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结构图：

这里仅作为一种学习，一般这种负载的话，Nginx是放到主机侧的， JavaWeb(Tomcat)应用放到容器里。

效果

新建文件夹。

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

一，Ngixn 镜像制作

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

Dockerfile 文件内容

FROM nginxLABEL maintainer="uag"ENV REFRESHED_AT 2021-08-27EXPOSE 8099

构建nginx配置文件内容

这个的配置文件，在容器运行的时候通过 -v参数与 容器内部共享。方便后期参数更改

cd ./nginxvim nginx.conf

nginx.conf 配置文件内容

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;                }        }    # 这里配置负载     upstream backend {    server 172.23.231.190:8069;    server 172.23.231.190:8079;    server 172.23.231.190:8089;}}

配置负载:172.23.231.190为宿主机IP,8069,8079,8089为对应的Java Web 暴露的应用端口。

 # 这里配置负载     upstream backend {    server 172.23.231.190:8069;    server 172.23.231.190:8079;    server 172.23.231.190:8089;}

构建Nginx镜像

docker build -t uag/uag_nginx .

二，java Web(Tomcat)应用镜像构建

cd uag_tomcat8/vim Dockerfile

Dockerfile 文件内容

FROM dordoka/tomcatMAINTAINER LIRUILONGCOPY UAWeb.war   /opt/tomcat/webapps/UAWeb.warEXPOSE 8080ENTRYPOINT [ "/opt/tomcat/bin/catalina.sh", "run" ]

上传对应的War包

lsDockerfile  UAWeb.war

构建镜像

docker build -t uag/uag_tomcat .

三，运行容器 Nginx镜像

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)镜像

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

查看运行的容器

浏览器访问

查看负载方式:新进程的方式

查看负载方式:-volumes-from 方式

Dockerfile文件

FROM nginxLABEL maintainer="uag"ENV REFRESHED_AT 2021-08-27VOLUME  /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.log172.23.231.190:8069 - 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

构建好镜像上传仓库：

嗯，需要注册一个Docker Hub账号，然后登录，需要镜像前面加 账户名/

┌──(liruilong㉿Liruilong)-[/mnt/e/docker/uag/uag_nginx]└─$ docker push liruilong/nginx_logThe 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_logThe push refers to repository [docker.io/liruilong/nginx_log]fb04ab8effa8: Pushed8f736d52032f: Pushed009f1d338b57: Pushed678bbd796838: Pushedd1279c519351: Pushedf68ef921efae: Pushedlatest: digest: sha256:2af7e8aeab84e8a816caf6b0342e1a45f95c7089ff52578040ea3a4c28a943c7 size: 1570┌──(liruilong㉿Liruilong)-[/mnt/e/docker/uag/uag_nginx]└─$  docker push liruilong/nginx_log:tagname  # 拉去镜像

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