基于Docker部署Tomcat集群、 Nginx负载均衡的问题小结(镜像负载)

写在前面

看完Dokcer相关的书籍，正好有个项目要这样搞，所以自己练习一下。

当作一百世一样。这里的道理很明白:我思故我在,既然我存在,就不能装作不存在。无论如何,我要为自己负起责任。——王小波《三十而立》

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 nginx
vim Dockerfile

Dockerfile 文件内容

FROM nginx
LABEL maintainer="uag"
ENV REFRESHED_AT 2021-08-27
EXPOSE 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 ./nginx
vim 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_age

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/tomcat
MAINTAINER LIRUILONG
COPY UAWeb.war   /opt/tomcat/webapps/UAWeb.war
EXPOSE 8080
ENTRYPOINT [ "/opt/tomcat/bin/catalina.sh", "run" ]

上传对应的War包

ls
Dockerfile  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 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

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_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  # 拉去镜像