注意：不能使用云服务器公网IP进行容器间的通信。
一、docker0分配网络和通信
1、docker0简介
我知道默认情况下docker启动后创建一个虚拟网桥docker0，并且所有容器网络都链接到docker0
eth0中的192.168.1.22是宿主机的IP地址，默认情况下使用Docker0作为路由器进行网络分配和通信。
Docker安装成功后，会安装一个docker0的网卡，由docker0分配网络和通信，整体流程图如下：
从上图中可以看出，容器直接的通信不是直连的，而是通过docker0间接通信，docker默认使用的是桥接模式，每启动一个容器，docker0会自动分配IP地址给容器，例如:docker0的ip为172.17.0.1，则第一个启动的容器ip为172.17.0.2，后启动的容器依次类推。
默认的docker0网络存在如下缺点:
(1)、容器间的访问只能通过IP（注意不是公网IP），不能通过容器名称。
(2)、容器删除重启后，IP地址会发生改变。
总结：由于IP地址经常变化，导致容器间的通信出现问题。如果通过容器名称进行通信，由于容器名称不会变化，故容器重启不会影响容器间的通信。
2、查看linux ip
输入命令：ip addr
此时没运行任何docker容器，只有三个网卡:其中lo中的127.0.0.1为本机IP，eth0中的192.168.0.150为云服务器的IP，docker0中的172.17.0.1为docker IP，
[root@hecs-140905 dockerfileAndWar]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether fa:16:3e:f0:48:de brd ff:ff:ff:ff:ff:ff inet 192.168.0.150/24 brd 192.168.0.255 scope global noprefixroute dynamic eth0 valid_lft 48768sec preferred_lft 48768sec inet6 fe80::f816:3eff:fef0:48de/64 scope link valid_lft forever preferred_lft forever 3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default link/ether 02:42:d2:c8:7c:c0 brd ff:ff:ff:ff:ff:ff inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0 valid_lft forever preferred_lft forever inet6 fe80::42:d2ff:fec8:7cc0/64 scope link valid_lft forever preferred_lft forever
3、查看容器的IP地址
docker network inspect bridge
结果如下：
"ConfigOnly": false, "Containers": { "fcd5318004f1ac39a1f62ea2913a2a6f844f2af9909a761400e6df87a5e616e6": { "Name": "myredis", "EndpointID": "758fd383f013af6755e4f914312a4944b237c766330a812c1ed4e54e5f105477", "MacAddress": "02:42:ac:11:00:02", "IPv4Address": "172.17.0.2/16", "IPv6Address": "" } },
内部网络地址为：172.17.0.2
或者使用命令：
docker inspect --format='{{.NetworkSettings.IPAddress}}' myredis
结果为：172.17.0.2
4、linx能不能ping通容器内部?
[root@xxx ~]# ping 172.17.0.2 PING 172.17.0.2 (172.17.0.2) 56(84) bytes of data. 64 bytes from 172.17.0.2: icmp_seq=1 ttl=64 time=0.051 ms 64 bytes from 172.17.0.2: icmp_seq=2 ttl=64 time=0.046 ms 64 bytes from 172.17.0.2: icmp_seq=3 ttl=64 time=0.047 ms 64 bytes from 172.17.0.2: icmp_seq=4 ttl=64 time=0.044 ms
发现可以ping通容器内部。
创建一个tomcat容器：
docker run -di --name=mytomcat3 -p 8080:8080 -v /usr/local/tomcat/webapps:/usr/local/tomcat/webapps tomcat
查看容器内部网络地址：
"Containers": { "147fc5911d63eced51ab6dda1cf80975b6c120b4a2e31a668aee03768923b37f": { "Name": "mytomcat3", "EndpointID": "8f43856a43e665d8cac0eeaf592c8bdc0d24cde2923aaecafad65a551ed565c5", "MacAddress": "02:42:ac:11:00:03", "IPv4Address": "172.17.0.3/16", "IPv6Address": "" }, "fcd5318004f1ac39a1f62ea2913a2a6f844f2af9909a761400e6df87a5e616e6": { "Name": "myredis", "EndpointID": "758fd383f013af6755e4f914312a4944b237c766330a812c1ed4e54e5f105477", "MacAddress": "02:42:ac:11:00:02", "IPv4Address": "172.17.0.2/16", "IPv6Address": "" } },
bridge网络中多了个名称为 mytomcat3的容器，分配的ip地址为 172.17.0.3。
测试下容器与容器之间是否能可以ping通，由于容器内没有ping命令，我们使用busybox（busybox参考：https://www.cnblogs.com/zwh0910/p/16435808.html）
[root@hecs-140905 ~]# docker exec -it busybox sh / # ping 172.17.0.2 PING 172.17.0.2 (172.17.0.2): 56 data bytes 64 bytes from 172.17.0.2: seq=0 ttl=64 time=0.081 ms 64 bytes from 172.17.0.2: seq=1 ttl=64 time=0.072 ms 64 bytes from 172.17.0.2: seq=2 ttl=64 time=0.072 ms 64 bytes from 172.17.0.2: seq=3 ttl=64 time=0.076 ms
同一个网络中的容器与容器之间是可以相互ping通的。
5、不同网络的容器能否ping通呢？
查看我创建的newnet网络：
docker network inspect newnet
部分结果如下：
"Containers": { "251c41931a6694d4a5a1660c39ce9c45750b78efdc0ec050def33c7bd8afa4b0": { "Name": "mysql8", "EndpointID": "f1d645dee87b231f25363b8eadebf15c9a9c77c1cd10345a35e942d0ac850241", "MacAddress": "02:42:c0:ac:00:0a", "IPv4Address": "192.172.0.10/16", "IPv6Address": "" }, },
我们能否在docker0网络中的busybox来ping通在newnet网络中的mysql8呢？
发现ping不通。
二、自定义网络
为解决上述问题，docker引入了自定义网络，自定义网络的优势如下:
(1)可以通过容器名称进行通信。
(2)通信是互相的，可以互相访问。
总结：容器间的访问可以通过容器名称，而且可以互相访问。
具体使用如下:
1、创建自定义网络
#创建自定义网络newnet，子网192.172.0.0,网关为192.172.0.1 #192.172.0.0/16 表示网络的ip范围为192.172.0.0-192.172.255.255 docker network create --driver bridge --subnet 192.172.0.0/16 --gateway 192.172.0.1 newnet
注意：创建自定义网络的时候，IP的前两个数字不要与eth0中的IP（如192.168.0.150）的前两位一样，否则可能导致浏览器无法访问的情况。
删除自定义网络
docker network rm networkName// 删除网络
2、查看docker网络信息
#查看docker网络信息
#bridge docker默认的网络
#host 使用宿主机网络
#mynet 创建的自定义网络
[root@hecs-140905 ~]# docker network ls
NETWORK ID NAME DRIVER SCOPE
dfd016599931 bridge bridge local
9951733f6b75 host host local
13e35e17f292 mynet bridge local
8efcdae3efd4 newnet bridge local
9eae2373bc1f none null local
3、启动两个容器，并指定使用自定义的网络
docker run -di --name=mytomcat1 -p 9000:8080 -v /usr/local/tomcat/webapps:/usr/local/tomcat/webapps --net newnet tomcat docker run -di --name=mytomcat2 -p 9001:8080 -v /usr/local/tomcat/webapps:/usr/local/tomcat/webapps --net newnet tomcat
查看容器的IP
"Containers": { "1182acd05690867ce9798009dcae96eaf44bf13f6ee5a984b82bf28c7b079f61": { "Name": "mytomcat1", "EndpointID": "2d0df3acc50331888f6b4d63f4faff5725e8cd132c3cb22fe0e8edd5110cf449", "MacAddress": "02:42:c0:ac:00:02", "IPv4Address": "192.172.0.2/16", "IPv6Address": "" },"d20a6f0af1fe290575830a3823bcf8d5d73aefdf67b093661373a491f7d94ab0": { "Name": "mytomcat2", "EndpointID": "e7337a12707be6b741deff443e2803d6a26cc8aca085430b630c6085378af2be", "MacAddress": "02:42:c0:ac:00:03", "IPv4Address": "192.172.0.3/16", "IPv6Address": "" }, },
4、自定义网络中两个容器可以互相访问
mytomcat1访问mytomcat2
注意：由于我的容器内无法使用ping命令，故只能用curl来访问。
[root@xxx ~]# docker exec -it mytomcat1 bash root@1182acd05690:/usr/local/tomcat# curl 192.172.0.3:8080 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>Apache Tomcat/10.0.14</title> <link href="favicon.ico" rel="icon" type="image/x-icon" /> <link href="tomcat.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="wrapper"> <div id="navigation" class="curved container"> <span id="nav-home"><a href="https://tomcat.apache.org/">Home</a></span> <span id="nav-hosts"><a href="/docs/">Documentation</a></span> <span id="nav-config"><a href="/docs/config/">Configuration</a></span> <span id="nav-examples"><a href="/examples/">Examples</a></span> <span id="nav-wiki"><a href="https://wiki.apache.org/tomcat/FrontPage">Wiki</a></span> <span id="nav-lists"><a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></span> <span id="nav-help"><a href="https://tomcat.apache.org/findhelp.html">Find Help</a></span> <br class="separator" /> </div> <div id="asf-box"> <h1>Apache Tomcat/10.0.14</h1> </div> <div id="upper" class="curved container"> <div id="congrats" class="curved container"> <h2>If you're seeing this, you've successfully installed Tomcat. Congratulations!</h2> </div> <div id="notice"> <img id="tomcat-logo" src="tomcat.svg" alt="[tomcat logo]" /> <div id="tasks"> <h3>Recommended Reading:</h3> <h4><a href="/docs/security-howto.html">Security Considerations How-To</a></h4> <h4><a href="/docs/manager-howto.html">Manager Application How-To</a></h4> <h4><a href="/docs/cluster-howto.html">Clustering/Session Replication How-To</a></h4> </div> </div> <div id="actions"> <div class="button"> <a class="container shadow" href="/manager/status"><span>Server Status</span></a> </div> <div class="button"> <a class="container shadow" href="/manager/html"><span>Manager App</span></a> </div> <div class="button"> <a class="container shadow" href="/host-manager/html"><span>Host Manager</span></a> </div> </div> <br class="separator" /> </div> <div id="middle" class="curved container"> <h3>Developer Quick Start</h3> <div class="col25"> <div class="container"> <p><a href="/docs/setup.html">Tomcat Setup</a></p> <p><a href="/docs/appdev/">First Web Application</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="/docs/realm-howto.html">Realms & AAA</a></p> <p><a href="/docs/jndi-datasource-examples-howto.html">JDBC DataSources</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="/examples/">Examples</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="https://wiki.apache.org/tomcat/Specifications">Servlet Specifications</a></p> <p><a href="https://wiki.apache.org/tomcat/TomcatVersions">Tomcat Versions</a></p> </div> </div> <br class="separator" /> </div> <div id="lower"> <div id="low-manage" class=""> <div class="curved container"> <h3>Managing Tomcat</h3> <p>For security, access to the <a href="/manager/html">manager webapp</a> is restricted. 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说明mytomcat1可以访问mytomcat2
mytomcat2访问mytomcat1
[root@xxx ~]# docker exec -it mytomcat2 bash root@d20a6f0af1fe:/usr/local/tomcat# curl 192.172.0.2:8080 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>Apache Tomcat/10.0.14</title> <link href="favicon.ico" rel="icon" type="image/x-icon" /> <link href="tomcat.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="wrapper"> <div id="navigation" class="curved container"> <span id="nav-home"><a href="https://tomcat.apache.org/">Home</a></span> <span id="nav-hosts"><a href="/docs/">Documentation</a></span> <span id="nav-config"><a href="/docs/config/">Configuration</a></span> <span id="nav-examples"><a href="/examples/">Examples</a></span> <span id="nav-wiki"><a href="https://wiki.apache.org/tomcat/FrontPage">Wiki</a></span> <span id="nav-lists"><a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></span> <span id="nav-help"><a href="https://tomcat.apache.org/findhelp.html">Find Help</a></span> <br class="separator" /> </div> <div id="asf-box"> <h1>Apache Tomcat/10.0.14</h1> </div> <div id="upper" class="curved container"> <div id="congrats" class="curved container"> <h2>If you're seeing this, you've successfully installed Tomcat. Congratulations!</h2> </div> <div id="notice"> <img id="tomcat-logo" src="tomcat.svg" alt="[tomcat logo]" /> <div id="tasks"> <h3>Recommended Reading:</h3> <h4><a href="/docs/security-howto.html">Security Considerations How-To</a></h4> <h4><a href="/docs/manager-howto.html">Manager Application How-To</a></h4> <h4><a href="/docs/cluster-howto.html">Clustering/Session Replication How-To</a></h4> </div> </div> <div id="actions"> <div class="button"> <a class="container shadow" href="/manager/status"><span>Server Status</span></a> </div> <div class="button"> <a class="container shadow" href="/manager/html"><span>Manager App</span></a> </div> <div class="button"> <a class="container shadow" href="/host-manager/html"><span>Host Manager</span></a> </div> </div> <br class="separator" /> </div> <div id="middle" class="curved container"> <h3>Developer Quick Start</h3> <div class="col25"> <div class="container"> <p><a href="/docs/setup.html">Tomcat Setup</a></p> <p><a href="/docs/appdev/">First Web Application</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="/docs/realm-howto.html">Realms & AAA</a></p> <p><a href="/docs/jndi-datasource-examples-howto.html">JDBC DataSources</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="/examples/">Examples</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="https://wiki.apache.org/tomcat/Specifications">Servlet Specifications</a></p> <p><a href="https://wiki.apache.org/tomcat/TomcatVersions">Tomcat Versions</a></p> </div> </div> <br class="separator" /> </div> <div id="lower"> <div id="low-manage" class=""> <div class="curved container"> <h3>Managing Tomcat</h3> <p>For security, access to the <a href="/manager/html">manager webapp</a> is restricted. Users are defined in:</p> <pre>$CATALINA_HOME/conf/tomcat-users.xml</pre> <p>In Tomcat 10.0 access to the manager application is split between different users. <a href="/docs/manager-howto.html">Read more...</a></p> <br /> <h4><a href="/docs/RELEASE-NOTES.txt">Release Notes</a></h4> <h4><a href="/docs/changelog.html">Changelog</a></h4> <h4><a href="https://tomcat.apache.org/migration.html">Migration Guide</a></h4> <h4><a href="https://tomcat.apache.org/security.html">Security Notices</a></h4> </div> </div> <div id="low-docs" class=""> <div class="curved container"> <h3>Documentation</h3> <h4><a href="/docs/">Tomcat 10.0 Documentation</a></h4> <h4><a href="/docs/config/">Tomcat 10.0 Configuration</a></h4> <h4><a href="https://wiki.apache.org/tomcat/FrontPage">Tomcat Wiki</a></h4> <p>Find additional important configuration information in:</p> <pre>$CATALINA_HOME/RUNNING.txt</pre> <p>Developers may be interested in:</p> <ul> <li><a href="https://tomcat.apache.org/bugreport.html">Tomcat 10.0 Bug Database</a></li> <li><a href="/docs/api/index.html">Tomcat 10.0 JavaDocs</a></li> <li><a href="https://github.com/apache/tomcat/tree/10.0.x">Tomcat 10.0 Git Repository at GitHub</a></li> </ul> </div> </div> <div id="low-help" class=""> <div class="curved container"> <h3>Getting Help</h3> <h4><a href="https://tomcat.apache.org/faq/">FAQ</a> and <a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></h4> <p>The following mailing lists are available:</p> <ul> <li id="list-announce"><strong><a href="https://tomcat.apache.org/lists.html#tomcat-announce">tomcat-announce</a><br /> Important announcements, releases, security vulnerability notifications. (Low volume).</strong> </li> <li><a href="https://tomcat.apache.org/lists.html#tomcat-users">tomcat-users</a><br /> User support and discussion </li> <li><a href="https://tomcat.apache.org/lists.html#taglibs-user">taglibs-user</a><br /> User support and discussion for <a href="https://tomcat.apache.org/taglibs/">Apache Taglibs</a> </li> <li><a href="https://tomcat.apache.org/lists.html#tomcat-dev">tomcat-dev</a><br /> Development mailing list, including commit messages </li> </ul> </div> </div> <br class="separator" /> </div> <div id="footer" class="curved container"> <div class="col20"> <div class="container"> <h4>Other Downloads</h4> <ul> <li><a href="https://tomcat.apache.org/download-connectors.cgi">Tomcat Connectors</a></li> <li><a href="https://tomcat.apache.org/download-native.cgi">Tomcat Native</a></li> <li><a href="https://tomcat.apache.org/taglibs/">Taglibs</a></li> <li><a href="/docs/deployer-howto.html">Deployer</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Other Documentation</h4> <ul> <li><a href="https://tomcat.apache.org/connectors-doc/">Tomcat Connectors</a></li> <li><a href="https://tomcat.apache.org/connectors-doc/">mod_jk Documentation</a></li> <li><a href="https://tomcat.apache.org/native-doc/">Tomcat Native</a></li> <li><a href="/docs/deployer-howto.html">Deployer</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Get Involved</h4> <ul> <li><a href="https://tomcat.apache.org/getinvolved.html">Overview</a></li> <li><a href="https://tomcat.apache.org/source.html">Source Repositories</a></li> <li><a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></li> <li><a href="https://wiki.apache.org/tomcat/FrontPage">Wiki</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Miscellaneous</h4> <ul> <li><a href="https://tomcat.apache.org/contact.html">Contact</a></li> <li><a href="https://tomcat.apache.org/legal.html">Legal</a></li> <li><a href="https://www.apache.org/foundation/sponsorship.html">Sponsorship</a></li> <li><a href="https://www.apache.org/foundation/thanks.html">Thanks</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Apache Software Foundation</h4> <ul> <li><a href="https://tomcat.apache.org/whoweare.html">Who We Are</a></li> <li><a href="https://tomcat.apache.org/heritage.html">Heritage</a></li> <li><a href="https://www.apache.org">Apache Home</a></li> <li><a href="https://tomcat.apache.org/resources.html">Resources</a></li> </ul> </div> </div> <br class="separator" /> </div> <p class="copyright">Copyright ©1999-2022 Apache Software Foundation. All Rights Reserved</p> </div> </body> </html>
说明mytomcat2可以访问mytomcat1。
5、再启动一个使用docker0的容器，默认使用的就是docker0的网络
#再启动一个使用docker0的容器，默认使用的就是docker0的网络
docker run -di --name=mytomcat3 -p 8080:8080 -v /usr/local/tomcat/webapps:/usr/local/tomcat/webapps tomcat
6、mytomcat3和mytomcat1、mytomcat2是否可以通信(两组容器都在不同的网段内，怎么实现通信呢)
使用docker network connect将容器和网络进行连接
#使用docker network connect将容器和网络进行连接
#（注意，是将容器和网络连接，不是网络和网络连接）
docker network connect newnet mytomcat3
查看mynet的网络信息
#查看mynet的网络信息
docker network inspect newnet
结果如下:
"Containers": { "1182acd05690867ce9798009dcae96eaf44bf13f6ee5a984b82bf28c7b079f61": { "Name": "mytomcat1", "EndpointID": "2d0df3acc50331888f6b4d63f4faff5725e8cd132c3cb22fe0e8edd5110cf449", "MacAddress": "02:42:c0:ac:00:02", "IPv4Address": "192.172.0.2/16", "IPv6Address": "" }, "147fc5911d63eced51ab6dda1cf80975b6c120b4a2e31a668aee03768923b37f": { "Name": "mytomcat3", "EndpointID": "95b02323de22ba073348942e9fa083657d1257c4a56989d33beb7a7566ca9906", "MacAddress": "02:42:c0:ac:00:04", "IPv4Address": "192.172.0.4/16", "IPv6Address": "" },"d20a6f0af1fe290575830a3823bcf8d5d73aefdf67b093661373a491f7d94ab0": { "Name": "mytomcat2", "EndpointID": "e7337a12707be6b741deff443e2803d6a26cc8aca085430b630c6085378af2be", "MacAddress": "02:42:c0:ac:00:03", "IPv4Address": "192.172.0.3/16", "IPv6Address": "" }, },
容器mytomcat3已经加入newnet网络中。
查看mytomcat3能否访问mytomcat1和mytomcat2
[root@xxx ~]# docker exec -it mytomcat3 bash root@147fc5911d63:/usr/local/tomcat# curl 192.172.0.3:8080 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>Apache Tomcat/10.0.14</title> <link href="favicon.ico" rel="icon" type="image/x-icon" /> <link href="tomcat.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="wrapper"> <div id="navigation" class="curved container"> <span id="nav-home"><a href="https://tomcat.apache.org/">Home</a></span> <span id="nav-hosts"><a href="/docs/">Documentation</a></span> <span id="nav-config"><a href="/docs/config/">Configuration</a></span> <span id="nav-examples"><a href="/examples/">Examples</a></span> <span id="nav-wiki"><a href="https://wiki.apache.org/tomcat/FrontPage">Wiki</a></span> <span id="nav-lists"><a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></span> <span id="nav-help"><a href="https://tomcat.apache.org/findhelp.html">Find Help</a></span> <br class="separator" /> </div> <div id="asf-box"> <h1>Apache Tomcat/10.0.14</h1> </div> <div id="upper" class="curved container"> <div id="congrats" class="curved container"> <h2>If you're seeing this, you've successfully installed Tomcat. Congratulations!</h2> </div> <div id="notice"> <img id="tomcat-logo" src="tomcat.svg" alt="[tomcat logo]" /> <div id="tasks"> <h3>Recommended Reading:</h3> <h4><a href="/docs/security-howto.html">Security Considerations How-To</a></h4> <h4><a href="/docs/manager-howto.html">Manager Application How-To</a></h4> <h4><a href="/docs/cluster-howto.html">Clustering/Session Replication How-To</a></h4> </div> </div> <div id="actions"> <div class="button"> <a class="container shadow" href="/manager/status"><span>Server Status</span></a> </div> <div class="button"> <a class="container shadow" href="/manager/html"><span>Manager App</span></a> </div> <div class="button"> <a class="container shadow" href="/host-manager/html"><span>Host Manager</span></a> </div> </div> <br class="separator" /> </div> <div id="middle" class="curved container"> <h3>Developer Quick Start</h3> <div class="col25"> <div class="container"> <p><a href="/docs/setup.html">Tomcat Setup</a></p> <p><a href="/docs/appdev/">First Web Application</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="/docs/realm-howto.html">Realms & AAA</a></p> <p><a href="/docs/jndi-datasource-examples-howto.html">JDBC DataSources</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="/examples/">Examples</a></p> </div> </div> <div class="col25"> <div class="container"> <p><a href="https://wiki.apache.org/tomcat/Specifications">Servlet Specifications</a></p> <p><a href="https://wiki.apache.org/tomcat/TomcatVersions">Tomcat Versions</a></p> </div> </div> <br class="separator" /> </div> <div id="lower"> <div id="low-manage" class=""> <div class="curved container"> <h3>Managing Tomcat</h3> <p>For security, access to the <a href="/manager/html">manager webapp</a> is restricted. Users are defined in:</p> <pre>$CATALINA_HOME/conf/tomcat-users.xml</pre> <p>In Tomcat 10.0 access to the manager application is split between different users. <a href="/docs/manager-howto.html">Read more...</a></p> <br /> <h4><a href="/docs/RELEASE-NOTES.txt">Release Notes</a></h4> <h4><a href="/docs/changelog.html">Changelog</a></h4> <h4><a href="https://tomcat.apache.org/migration.html">Migration Guide</a></h4> <h4><a href="https://tomcat.apache.org/security.html">Security Notices</a></h4> </div> </div> <div id="low-docs" class=""> <div class="curved container"> <h3>Documentation</h3> <h4><a href="/docs/">Tomcat 10.0 Documentation</a></h4> <h4><a href="/docs/config/">Tomcat 10.0 Configuration</a></h4> <h4><a href="https://wiki.apache.org/tomcat/FrontPage">Tomcat Wiki</a></h4> <p>Find additional important configuration information in:</p> <pre>$CATALINA_HOME/RUNNING.txt</pre> <p>Developers may be interested in:</p> <ul> <li><a href="https://tomcat.apache.org/bugreport.html">Tomcat 10.0 Bug Database</a></li> <li><a href="/docs/api/index.html">Tomcat 10.0 JavaDocs</a></li> <li><a href="https://github.com/apache/tomcat/tree/10.0.x">Tomcat 10.0 Git Repository at GitHub</a></li> </ul> </div> </div> <div id="low-help" class=""> <div class="curved container"> <h3>Getting Help</h3> <h4><a href="https://tomcat.apache.org/faq/">FAQ</a> and <a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></h4> <p>The following mailing lists are available:</p> <ul> <li id="list-announce"><strong><a href="https://tomcat.apache.org/lists.html#tomcat-announce">tomcat-announce</a><br /> Important announcements, releases, security vulnerability notifications. (Low volume).</strong> </li> <li><a href="https://tomcat.apache.org/lists.html#tomcat-users">tomcat-users</a><br /> User support and discussion </li> <li><a href="https://tomcat.apache.org/lists.html#taglibs-user">taglibs-user</a><br /> User support and discussion for <a href="https://tomcat.apache.org/taglibs/">Apache Taglibs</a> </li> <li><a href="https://tomcat.apache.org/lists.html#tomcat-dev">tomcat-dev</a><br /> Development mailing list, including commit messages </li> </ul> </div> </div> <br class="separator" /> </div> <div id="footer" class="curved container"> <div class="col20"> <div class="container"> <h4>Other Downloads</h4> <ul> <li><a href="https://tomcat.apache.org/download-connectors.cgi">Tomcat Connectors</a></li> <li><a href="https://tomcat.apache.org/download-native.cgi">Tomcat Native</a></li> <li><a href="https://tomcat.apache.org/taglibs/">Taglibs</a></li> <li><a href="/docs/deployer-howto.html">Deployer</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Other Documentation</h4> <ul> <li><a href="https://tomcat.apache.org/connectors-doc/">Tomcat Connectors</a></li> <li><a href="https://tomcat.apache.org/connectors-doc/">mod_jk Documentation</a></li> <li><a href="https://tomcat.apache.org/native-doc/">Tomcat Native</a></li> <li><a href="/docs/deployer-howto.html">Deployer</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Get Involved</h4> <ul> <li><a href="https://tomcat.apache.org/getinvolved.html">Overview</a></li> <li><a href="https://tomcat.apache.org/source.html">Source Repositories</a></li> <li><a href="https://tomcat.apache.org/lists.html">Mailing Lists</a></li> <li><a href="https://wiki.apache.org/tomcat/FrontPage">Wiki</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Miscellaneous</h4> <ul> <li><a href="https://tomcat.apache.org/contact.html">Contact</a></li> <li><a href="https://tomcat.apache.org/legal.html">Legal</a></li> <li><a href="https://www.apache.org/foundation/sponsorship.html">Sponsorship</a></li> <li><a href="https://www.apache.org/foundation/thanks.html">Thanks</a></li> </ul> </div> </div> <div class="col20"> <div class="container"> <h4>Apache Software Foundation</h4> <ul> <li><a href="https://tomcat.apache.org/whoweare.html">Who We Are</a></li> <li><a href="https://tomcat.apache.org/heritage.html">Heritage</a></li> <li><a href="https://www.apache.org">Apache Home</a></li> <li><a href="https://tomcat.apache.org/resources.html">Resources</a></li> </ul> </div> </div> <br class="separator" /> </div> <p class="copyright">Copyright ©1999-2022 Apache Software Foundation. All Rights Reserved</p> </div> </body> </html>
说明mytomcat3能访问mytomcat2。
7、自定义网络的整体概括图
自定义网络的意义：应用集群下，docker容器间的的网络通信，将变得更加方便
