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負載均衡如何在Tomcat容器中實現？針對這個問題，這篇文章詳細介紹了相對應的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。
下載Tomcat8鏡像
[root@localhost ~]# docker search tomcat8 NAME DESCRIPTION STARS OFFICIAL AUTOMATED ashince/tomcat8 Tomcat GUI Manager pre-configured docker ima… 5 podbox/tomcat8 2 [OK]
這個tomcat包含了jdk而且啟動了可以直接訪問，自己啟動了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 啟動一個Nginx容器和兩個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
#將Nginx容器當中的配置拷貝到本地修改，因為容器當中沒有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;
}
}
#兩臺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",
拷貝靜態資源到Nginx目錄下做動靜分離 ，同時修改配置文件
#將其中一臺Tomcat的ROOT目錄拷貝到本地，因為做動靜分離Nginx需要訪問靜態資源要在本地
[root@localhost ~]# docker cp 72e174adc77d:/usr/local/tomcat/webapps/ROOT .
#拷貝到Nginx發布目錄下面
[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，修改完后拷貝會容器當中
[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;
}
}
#加載新的配置項
[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再去訪問Nginx 80端口如圖所示：
補充知識：Docker 基礎操作 容器自啟動 刪除鏡像和刪除容器
Docker容器自動重啟設置
重啟reboot操作系統后，發現docker 服務未啟動，容器也未啟動，怎么才能重啟后自動啟動呢
1、docker服務自動重啟設置
[root@localhost ~]# systemctl enable docker.service
2、docker容器自動啟動設置
[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容器自動啟動設置
[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
當一個host中鏡像和容器較多，需要重置時可選擇刪除其中部分或全部的鏡像和容器。那么你就需要下面的操作了。
1、刪除容器
[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）刪除所有的容器（只刪除單個時把后面的變量改為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、刪除鏡像
1）查看host中的鏡像
docker images
2）刪除指定id的鏡像
docker rmi <image id>
3）刪除全部的images
docker rmi $(docker images -q)
3、當要刪除的iamges和其他的鏡像有關聯而無法刪除時
可通過 -f 參數強制刪除
docker rmi -f $(docker images -q)
關于負載均衡如何在Tomcat容器中實現問題的解答就分享到這里了，希望以上內容可以對大家有一定的幫助，如果你還有很多疑惑沒有解開，可以關注億速云行業資訊頻道了解更多相關知識。
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