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負載均衡如何在Tomcat容器中實現(xiàn)

發(fā)布時間：2020-11-20 15:03:11 來源：億速云 閱讀：164 作者：Leah 欄目：開發(fā)技術

負載均衡如何在Tomcat容器中實現(xiàn)？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

負載均衡如何在Tomcat容器中實現(xiàn)

#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(tài)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(tài)資源要在本地
[root@localhost ~]# docker cp 72e174adc77d:/usr/local/tomcat/webapps/ROOT .
 
#拷貝到Nginx發(fā)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：

負載均衡如何在Tomcat容器中實現(xiàn)

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(tǒng)后，發(fā)現(xiàn)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(lián)而無法刪除時

可通過 -f 參數(shù)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(xiàn)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(yè)資訊頻道了解更多相關知識。

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