查看Docker容器的信息的方法實(shí)現(xiàn)
對(duì)于運(yùn)行在Docker環(huán)境的容器,有時(shí)我們想查詢它們的一些基本信息,例如環(huán)境變量、hostname、ip地址等,接下來(lái)我們以一個(gè)tomcat容器為例,看看有哪些方式來(lái)取得這些信息;
創(chuàng)建tomcat容器
在docker環(huán)境下執(zhí)行如下命令,即可創(chuàng)建一個(gè)名為tomcat001的tomcat容器:
docker run --name tomcat001 -idt tomcat
執(zhí)行docker ps檢查一下,容器創(chuàng)建成功:
root@maven:~# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 98d119ed4c73 tomcat "catalina.sh run" 10 minutes ago Up 10 minutes 8080/tcp tomcat001
獲取信息常用的方式有如下三種:
- 進(jìn)入容器內(nèi)部獲取信息;
- 執(zhí)行docker exec命令;
- 執(zhí)行docker inspect -f命令(推薦方式);
第一種:進(jìn)入容器內(nèi)部獲取信息
執(zhí)行以下命令可進(jìn)入容器內(nèi)部:
docker exec -it tomcat001 /bin/bash
此時(shí)已進(jìn)入容器內(nèi)部,所以分別執(zhí)行hostname、ip addr、env這三個(gè)命令可以獲取相關(guān)信息,如下:
root@98d119ed4c73:/usr/local/tomcat# hostname 98d119ed4c73 root@98d119ed4c73:/usr/local/tomcat# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 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 17: eth0@if18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default link/ether 02:42:ac:11:00:05 brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet 172.17.0.5/16 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::42:acff:fe11:5/64 scope link valid_lft forever preferred_lft forever root@98d119ed4c73:/usr/local/tomcat# env LD_LIBRARY_PATH=/usr/local/tomcat/native-jni-lib CATALINA_HOME=/usr/local/tomcat LANG=C.UTF-8 HOSTNAME=98d119ed4c73 OPENSSL_VERSION=1.1.0f-3+deb9u1 TOMCAT_VERSION=8.5.24 GPG_KEYS=05AB33110949707C93A279E3D3EFE6B686867BA6 07E48665A34DCAFAE522E5E6266191C37C037D42 47309207D818FFD8DCD3F83F1931D684307A10A5 541FBE7D8F78B25E055DDEE13C370389288584E7 61B832AC2F1C5A90F0F9B00A1C506407564C17A3 713DA88BE50911535FE716F5208B0AB1D63011C7 79F7026C690BAA50B92CD8B66A3AD3F4F22C4FED 9BA44C2621385CB966EBA586F72C284D731FABEE A27677289986DB50844682F8ACB77FC2E86E29AC A9C5DF4D22E99998D9875A5110C01C5A2F6059E7 DCFD35E0BF8CA7344752DE8B6FB21E8933C60243 F3A04C595DB5B6A5F1ECA43E3B7BBB100D811BBE F7DA48BB64BCB84ECBA7EE6935CD23C10D498E23 JAVA_HOME=/docker-java-home/jre TOMCAT_NATIVE_LIBDIR=/usr/local/tomcat/native-jni-lib JAVA_VERSION=8u151 PWD=/usr/local/tomcat HOME=/root CA_CERTIFICATES_JAVA_VERSION=20170531+nmu1 TOMCAT_MAJOR=8 JAVA_DEBIAN_VERSION=8u151-b12-1~deb9u1 TOMCAT_SHA1=9e26ba61c5665aafc849073edeb769be555283cd TERM=xterm SHLVL=1 TOMCAT_ASC_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc https://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc https://www.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc https://archive.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc PATH=/usr/local/tomcat/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin TOMCAT_TGZ_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz https://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz https://www.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz https://archive.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz _=/usr/bin/env
第二種:執(zhí)行docker exec命令
不用進(jìn)入容器,直接在docker環(huán)境執(zhí)行docker exec 容器名 容器內(nèi)命令的方式也可以獲取相關(guān)信息,舉例如下:
- 獲取容器的hostname:docker exec tomcat001 hostname
- 獲取容器ip地址:docker exec tomcat001 ip addr
- 獲取容器環(huán)境變量:docker exec tomcat001 env
執(zhí)行結(jié)果如下所示:
root@maven:~# docker exec tomcat001 hostname 98d119ed4c73 root@maven:~# docker exec tomcat001 ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 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 17: eth0@if18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default link/ether 02:42:ac:11:00:05 brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet 172.17.0.5/16 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::42:acff:fe11:5/64 scope link valid_lft forever preferred_lft forever root@maven:~# docker exec tomcat001 env PATH=/usr/local/tomcat/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOSTNAME=98d119ed4c73 LANG=C.UTF-8 JAVA_HOME=/docker-java-home/jre JAVA_VERSION=8u151 JAVA_DEBIAN_VERSION=8u151-b12-1~deb9u1 CA_CERTIFICATES_JAVA_VERSION=20170531+nmu1 CATALINA_HOME=/usr/local/tomcat TOMCAT_NATIVE_LIBDIR=/usr/local/tomcat/native-jni-lib LD_LIBRARY_PATH=/usr/local/tomcat/native-jni-lib OPENSSL_VERSION=1.1.0f-3+deb9u1 GPG_KEYS=05AB33110949707C93A279E3D3EFE6B686867BA6 07E48665A34DCAFAE522E5E6266191C37C037D42 47309207D818FFD8DCD3F83F1931D684307A10A5 541FBE7D8F78B25E055DDEE13C370389288584E7 61B832AC2F1C5A90F0F9B00A1C506407564C17A3 713DA88BE50911535FE716F5208B0AB1D63011C7 79F7026C690BAA50B92CD8B66A3AD3F4F22C4FED 9BA44C2621385CB966EBA586F72C284D731FABEE A27677289986DB50844682F8ACB77FC2E86E29AC A9C5DF4D22E99998D9875A5110C01C5A2F6059E7 DCFD35E0BF8CA7344752DE8B6FB21E8933C60243 F3A04C595DB5B6A5F1ECA43E3B7BBB100D811BBE F7DA48BB64BCB84ECBA7EE6935CD23C10D498E23 TOMCAT_MAJOR=8 TOMCAT_VERSION=8.5.24 TOMCAT_SHA1=9e26ba61c5665aafc849073edeb769be555283cd TOMCAT_TGZ_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz https://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz https://www.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz https://archive.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz TOMCAT_ASC_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc https://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc https://www.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc https://archive.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc HOME=/root
第三種:使用docker inspect命令
推薦使用docker inspect來(lái)獲取信息,這個(gè)命令會(huì)返回一個(gè)json字符串,里面以key-value的格式準(zhǔn)備了該容器相關(guān)的信息,內(nèi)容十分豐富,可以一次性取得全部?jī)?nèi)容,也可以返回指定key對(duì)應(yīng)的信息;
我們先來(lái)看看所有內(nèi)容,執(zhí)行命令docker inspect tomcat001,可以看到如下信息:
root@maven:~# docker inspect tomcat001 [ { "Id": "98d119ed4c73c750e53353e77f7c6942803809a9d5dedc28d8b0f41ce58b8b17", "Created": "2018-05-06T07:39:45.464492435Z", "Path": "catalina.sh", "Args": [ "run" ], "State": { "Status": "running", "Running": true, "Paused": false, "Restarting": false, "OOMKilled": false, "Dead": false, "Pid": 22468, "ExitCode": 0, "Error": "", "StartedAt": "2018-05-06T07:39:46.143092505Z", "FinishedAt": "0001-01-01T00:00:00Z" }, "Image": "sha256:3dcfe809147daf54fbdbe1f6886b4c49df63f28e2b3c8ac119fef6a7f7490d3c", "ResolvConfPath": "/var/lib/docker/containers/98d119ed4c73c750e53353e77f7c6942803809a9d5dedc28d8b0f41ce58b8b17/resolv.conf", "HostnamePath": "/var/lib/docker/containers/98d119ed4c73c750e53353e77f7c6942803809a9d5dedc28d8b0f41ce58b8b17/hostname", "HostsPath": "/var/lib/docker/containers/98d119ed4c73c750e53353e77f7c6942803809a9d5dedc28d8b0f41ce58b8b17/hosts", "LogPath": "/var/lib/docker/containers/98d119ed4c73c750e53353e77f7c6942803809a9d5dedc28d8b0f41ce58b8b17/98d119ed4c73c750e53353e77f7c6942803809a9d5dedc28d8b0f41ce58b8b17-json.log", "Name": "/tomcat001", "RestartCount": 0, "Driver": "aufs", "MountLabel": "", "ProcessLabel": "", "AppArmorProfile": "", "ExecIDs": [ "cffec99f38514024f6a6e31e0e160d37d295041e4813a2245466be2dbc9c4037" ], "HostConfig": { "Binds": null, "ContainerIDFile": "", "LogConfig": { "Type": "json-file", "Config": {} }, "NetworkMode": "default", "PortBindings": {}, "RestartPolicy": { "Name": "no", "MaximumRetryCount": 0 }, "AutoRemove": false, "VolumeDriver": "", "VolumesFrom": null, "CapAdd": null, "CapDrop": null, "Dns": [], "DnsOptions": [], "DnsSearch": [], "ExtraHosts": null, "GroupAdd": null, "IpcMode": "", "Cgroup": "", "Links": null, "OomScoreAdj": 0, "PidMode": "", "Privileged": false, "PublishAllPorts": false, "ReadonlyRootfs": false, "SecurityOpt": null, "UTSMode": "", "UsernsMode": "", "ShmSize": 67108864, "Runtime": "runc", "ConsoleSize": [ 0, 0 ], "Isolation": "", "CpuShares": 0, "Memory": 0, "NanoCpus": 0, "CgroupParent": "", "BlkioWeight": 0, "BlkioWeightDevice": null, "BlkioDeviceReadBps": null, "BlkioDeviceWriteBps": null, "BlkioDeviceReadIOps": null, "BlkioDeviceWriteIOps": null, "CpuPeriod": 0, "CpuQuota": 0, "CpuRealtimePeriod": 0, "CpuRealtimeRuntime": 0, "CpusetCpus": "", "CpusetMems": "", "Devices": [], "DiskQuota": 0, "KernelMemory": 0, "MemoryReservation": 0, "MemorySwap": 0, "MemorySwappiness": -1, "OomKillDisable": false, "PidsLimit": 0, "Ulimits": null, "CpuCount": 0, "CpuPercent": 0, "IOMaximumIOps": 0, "IOMaximumBandwidth": 0 }, "GraphDriver": { "Name": "aufs", "Data": null }, "Mounts": [], "Config": { "Hostname": "98d119ed4c73", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "ExposedPorts": { "8080/tcp": {} }, "Tty": true, "OpenStdin": true, "StdinOnce": false, "Env": [ "PATH=/usr/local/tomcat/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "LANG=C.UTF-8", "JAVA_HOME=/docker-java-home/jre", "JAVA_VERSION=8u151", "JAVA_DEBIAN_VERSION=8u151-b12-1~deb9u1", "CA_CERTIFICATES_JAVA_VERSION=20170531+nmu1", "CATALINA_HOME=/usr/local/tomcat", "TOMCAT_NATIVE_LIBDIR=/usr/local/tomcat/native-jni-lib", "LD_LIBRARY_PATH=/usr/local/tomcat/native-jni-lib", "OPENSSL_VERSION=1.1.0f-3+deb9u1", "GPG_KEYS=05AB33110949707C93A279E3D3EFE6B686867BA6 07E48665A34DCAFAE522E5E6266191C37C037D42 47309207D818FFD8DCD3F83F1931D684307A10A5 541FBE7D8F78B25E055DDEE13C370389288584E7 61B832AC2F1C5A90F0F9B00A1C506407564C17A3 713DA88BE50911535FE716F5208B0AB1D63011C7 79F7026C690BAA50B92CD8B66A3AD3F4F22C4FED 9BA44C2621385CB966EBA586F72C284D731FABEE A27677289986DB50844682F8ACB77FC2E86E29AC A9C5DF4D22E99998D9875A5110C01C5A2F6059E7 DCFD35E0BF8CA7344752DE8B6FB21E8933C60243 F3A04C595DB5B6A5F1ECA43E3B7BBB100D811BBE F7DA48BB64BCB84ECBA7EE6935CD23C10D498E23", "TOMCAT_MAJOR=8", "TOMCAT_VERSION=8.5.24", "TOMCAT_SHA1=9e26ba61c5665aafc849073edeb769be555283cd", "TOMCAT_TGZ_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz \thttps://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz \thttps://www.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz \thttps://archive.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz", "TOMCAT_ASC_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename=tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc \thttps://www-us.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc \thttps://www.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc \thttps://archive.apache.org/dist/tomcat/tomcat-8/v8.5.24/bin/apache-tomcat-8.5.24.tar.gz.asc" ], "Cmd": [ "catalina.sh", "run" ], "ArgsEscaped": true, "Image": "tomcat", "Volumes": null, "WorkingDir": "/usr/local/tomcat", "Entrypoint": null, "OnBuild": null, "Labels": {} }, "NetworkSettings": { "Bridge": "", "SandboxID": "50244517221e6faff4217ff5453919f0c297b10434812ecfbf3decb3ce9860f6", "HairpinMode": false, "LinkLocalIPv6Address": "", "LinkLocalIPv6PrefixLen": 0, "Ports": { "8080/tcp": null }, "SandboxKey": "/var/run/docker/netns/50244517221e", "SecondaryIPAddresses": null, "SecondaryIPv6Addresses": null, "EndpointID": "e9336feece03b1c87e6724253575ee50963e9bdc1f9618609fe641a8a939b87a", "Gateway": "172.17.0.1", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "IPAddress": "172.17.0.5", "IPPrefixLen": 16, "IPv6Gateway": "", "MacAddress": "02:42:ac:11:00:05", "Networks": { "bridge": { "IPAMConfig": null, "Links": null, "Aliases": null, "NetworkID": "87eb4d08d408c08489db4460915aabed59210d04f8193364420d3719cd308d83", "EndpointID": "e9336feece03b1c87e6724253575ee50963e9bdc1f9618609fe641a8a939b87a", "Gateway": "172.17.0.1", "IPAddress": "172.17.0.5", "IPPrefixLen": 16, "IPv6Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "MacAddress": "02:42:ac:11:00:05" } } } } ]
可見(jiàn)內(nèi)容十分豐富;
如果我們只對(duì)其中的一些感興趣,例如hostname、ip地址、環(huán)境變量,該如何查看呢?
hostname:在返回值中,hostname的位置如下圖紅框所示,
由上圖可見(jiàn),hostname位于Config.Hostname這個(gè)節(jié)點(diǎn)位置,所以執(zhí)行命令docker inspect -f {{.Config.Hostname}} tomcat001即可獲取到hostname,如下所示:
root@maven:~# docker inspect -f {{.Config.Hostname}} tomcat001 98d119ed4c73
ip地址:執(zhí)行命令docker inspect -f {{.NetworkSettings.IPAddress}} tomcat001即可獲取到ip地址:
root@maven:~# docker inspect -f {{.NetworkSettings.IPAddress}} tomcat001 172.17.0.5
環(huán)境變量:從完整的inspect信息中可以看到環(huán)境變量Config.Env的內(nèi)容是個(gè)json數(shù)組,所以除了用docker inspect -f {{.Config.Env}} tomcat001獲取所有環(huán)境變量信息,還可以用docker inspect -f ‘{{index .Config.Env 1}}’ tomcat001命令獲取數(shù)組中的某一條記錄,如下:
root@maven:~# docker inspect -f '{{index .Config.Env 1}}' tomcat001 LANG=C.UTF-8 root@maven:~# docker inspect -f '{{index .Config.Env 2}}' tomcat001 JAVA_HOME=/docker-java-home/jre
至此,三種獲取容器信息的方式已經(jīng)全部列出,之所以在本文中推薦第三種,是因?yàn)橛袝r(shí)我們會(huì)在shell腳本中獲取容器信息,這時(shí)候用這種方式最為簡(jiǎn)單;
到此這篇關(guān)于查看Docker容器的信息的方法實(shí)現(xiàn)的文章就介紹到這了,更多相關(guān)查看Docker容器信息內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!
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