Docker Nginx容器和Tomcat容器实现负载均衡与动静分离操作（docker是干什么的）

下载Tomcat8镜像

[root@localhost ~]# docker search tomcat8 NAME DESCRIPTION STARS OFFICIAL AUTOMATED ashince/tomcat8 Tomcat GUI Manager pre-configured docker ima… 5 podbox/tomcat8 2 [OK]

这个tomcat包含了jdk而且启动了可以直接访问，自己启动了8080端口

[root@localhost ~]# docker pull ashince/tomcat8 Using default tag: latest latest: Pulling from ashince/tomcat8 06b22ddb1913: Pulling fs layer 336c28b408ed: Pull complete 1f3e6b8d80c3: Pull complete [root@localhost ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest 2622e6cca7eb 2 weeks ago 132MB ashince/tomcat8 latest 02aedead27dd 22 months ago 314MB 启动一个Nginx容器和两个Tomcat容器 [root@localhost ~]# docker run -itd -p 8080:8080 ashince/tomcat8 3e3f2aabe67de7ee3f4b6d62176e21aaa9d2302922845cb08ad37af7146b13c5 [root@localhost ~]# docker run -itd -p 8081:8080 ashince/tomcat8 644d59711c805a626b7c1c219aa018f744098a14dd41e54744d6b13e7ba66a2f [root@localhost ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES cca55c4ad919 ashince/tomcat8 "catalina.sh run" About a minute ago Up About a minute 0.0.0.0:8081->8080/tcp unruffled_lalande 08b58d2f41d6 ashince/tomcat8 "catalina.sh run" 7 minutes ago Up 7 minutes 0.0.0.0:8080->8080/tcp relaxed_williamson aeebcb0b40a2 nginx "/docker-entrypoint.…" 2 hours ago Up 2 hours 0.0.0.0:80->80/tcp priceless_ardinghelli

#将Nginx容器当中的配置拷贝到本地修改，因为容器当中没有vi vim命令 [root@localhost ~]# docker cp 68d2bdf336ed:/etc/nginx/conf.d/default.conf . [root@localhost ~]# ls anaconda-ks.cfg default.conf index.html [root@localhost ~]# grep -vE "#|^$" default.conf server { listen 80; listen [::]:80; server_name localhost; location / { root /usr/share/nginx/html; index index.html index.htm; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } } #两台tomcat的ip地址 [root@localhost ~]# for i in {72e174adc77d,080068dae40a};do docker inspect $i| grep -i ipaddr |tail -n 1;done "IPAddress": "172.17.0.4", "IPAddress": "172.17.0.3", 拷贝静态资源到Nginx目录下做动静分离 ，同时修改配置文件 #将其中一台Tomcat的ROOT目录拷贝到本地，因为做动静分离Nginx需要访问静态资源要在本地 [root@localhost ~]# docker cp 72e174adc77d:/usr/local/tomcat/webapps/ROOT . #拷贝到Nginx发布目录下面 [root@localhost ~]# docker cp ROOT 68d2bdf336ed:/usr/share/nginx/html/ [root@localhost WEB-INF]# docker exec 68d2bdf336ed ls -l /usr/share/nginx/html/ROOT total 184 -rwxrwxrwx 1 root root 7064 Jun 21 2017 RELEASE-NOTES.txt drwxrwxrwx 2 root root 21 Jul 27 2017 WEB-INF -rwxrwxrwx 1 root root 26447 Jun 21 2017 asf-logo-wide.svg -rwxrwxrwx 1 root root 713 Jun 21 2017 bg-button.png -rwxrwxrwx 1 root root 1918 Jun 21 2017 bg-middle.png -rwxrwxrwx 1 root root 1392 Jun 21 2017 bg-nav-item.png -rwxrwxrwx 1 root root 1401 Jun 21 2017 bg-nav.png -rwxrwxrwx 1 root root 3103 Jun 21 2017 bg-upper.png -rwxrwxrwx 1 root root 21630 Jun 21 2017 favicon.ico -rwxrwxrwx 1 root root 12279 Jun 21 2017 index.jsp -rwxrwxrwx 1 root root 2376 Jun 21 2017 tomcat-power.gif -rwxrwxrwx 1 root root 5581 Jun 21 2017 tomcat.css -rwxrwxrwx 1 root root 2066 Jun 21 2017 tomcat.gif -rwxrwxrwx 1 root root 5103 Jun 21 2017 tomcat.png -rwxrwxrwx 1 root root 67795 Jun 21 2017 tomcat.svg #修改后的Nginx配置文件如下，修改完后拷贝会容器当中 [root@localhost ~]# docker cp default.conf 68d2bdf336ed:/etc/nginx/conf.d/default.conf [root@localhost ~]# docker exec 68d2bdf336ed cat /etc/nginx/conf.d/default.conf upstream tomcat_web{ server 172.17.0.3:8080 weight=100 max_fails=2 fail_timeout=15; server 172.17.0.4:8080 weight=100 max_fails=2 fail_timeout=15; } server { listen 80; listen [::]:80; server_name localhost; error_page 500 502 503 504 /50x.html; root /usr/share/nginx/html; location /{ proxy_pass http://tomcat_web; proxy_set_header host $host; } location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|flv|mp4|ico)$ { root /usr/share/nginx/html/ROOT; expires 30d; access_log off; } location ~ .*\.(eot|ttf|otf|woff|svg)$ { root /usr/share/nginx/html/ROOT; expires 30d; access_log off; } location ~ .*\.(js|css)$ { root /usr/share/nginx/html/ROOT; expires 30d; access_log off; } location = /50x.html { root /usr/share/nginx/html; } } #加载新的配置项 [root@localhost ~]# docker exec -it 68d2bdf336ed /bin/bash root@68d2bdf336ed:/# /usr/sbin/nginx -s reload 2020/06/29 07:12:05 [notice] 79#79: signal process started

再去访问Nginx 80端口如图所示：

补充知识：Docker 基础操作 容器自启动 删除镜像和删除容器

Docker容器自动重启设置

重启reboot操作系统后，发现docker 服务未启动，容器也未启动，怎么才能重启后自动启动呢

1、docker服务自动重启设置

[root@localhost ~]# systemctl enable docker.service

2、docker容器自动启动设置

[root@localhost ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest 5a3221f0137b 10 months ago 126MB [root@localhost ~]# docker run -itd -p 80:80 nginx 3e28c4b5c6256c0ba04666751e426987d848b7afeb9c59774d5e9831dc78e5ee [root@localhost ~]# docker run -itd -p 81:80 nginx f0597c725fd6b7f4229aa9ab5de4a3cb29d09097a81dc8f64d1a60d469001379 [root@localhost ~]# docker port f0597c725fd6 80/tcp -> 0.0.0.0:81 [root@localhost ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES f0597c725fd6 nginx "nginx -g 'daemon of?? 30 seconds ago Up 29 seconds 0.0.0.0:81->80/tcp elastic_allen 3e28c4b5c625 nginx "nginx -g 'daemon of?? 35 seconds ago Up 33 seconds 0.0.0.0:80->80/tcp tender_volhard

3、 docker容器自动启动设置

[root@localhost ~]# docker update --restart=always f0597c725fd6 3e28c4b5c625 f0597c725fd6 3e28c4b5c625 [root@localhost ~]# reboot -h now Connection closed by foreign host. [root@localhost ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES f0597c725fd6 nginx "nginx -g 'daemon of?? 13 minutes ago Up 2 minutes 0.0.0.0:81->80/tcp elastic_allen 3e28c4b5c625 nginx "nginx -g 'daemon of?? 13 minutes ago Up 2 minutes 0.0.0.0:80->80/tcp tender_volhard

当一个host中镜像和容器较多，需要重置时可选择删除其中部分或全部的镜像和容器。那么你就需要下面的操作了。

1、删除容器

[root@localhost ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 27c5c4d3cf86 nginx "nginx -g 'daemon of?? 2 minutes ago Up 2 minutes 0.0.0.0:80->80/tcp gracious_nash 61cccfe238a8 nginx "nginx -g 'daemon of?? 2 minutes ago Up 2 minutes 0.0.0.0:81->80/tcp distracted_grothendieck [root@localhost ~]# docker ps -aq 27c5c4d3cf86 61cccfe238a8

1）首先需要停止所有的容器

[root@localhost ~]# docker ps -aq f0597c725fd6 3e28c4b5c625 8855c7777f83 466d2efe3dd9 20ca589b1a10 e5457b41cae6 314d1d01c941 [root@localhost ~]# docker stop $(docker ps -aq) f0597c725fd6 3e28c4b5c625 8855c7777f83 466d2efe3dd9 20ca589b1a10 e5457b41cae6 314d1d01c941 [root@localhost ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

2）删除所有的容器（只删除单个时把后面的变量改为image id即可）

[root@localhost ~]# docker rm -f $(docker ps -aq) f0597c725fd6 3e28c4b5c625 8855c7777f83 466d2efe3dd9 20ca589b1a10 e5457b41cae6 314d1d01c941 [root@localhost ~]# docker ps -aq [root@localhost ~]#

2、删除镜像

1）查看host中的镜像

docker images

2）删除指定id的镜像

docker rmi

3）删除全部的images

docker rmi $(docker images -q)

3、当要删除的iamges和其他的镜像有关联而无法删除时

可通过 -f 参数强制删除

docker rmi -f $(docker images -q)