その１４：ネットワークの概要のつづき。
最初の一歩：vm （Container Optimized-os）への入り方（zone は環境による）
$ gcloud auth login
$ gcloud compute instances list
$ gcloud compute ssh --project <project-id> --zone asia-northeast1-b <vm-name>
次の一歩：コンテナへの入り方
$ docker ps
$ docker container exec -it <container id> bash
コンテナを調査して Network のところを確認する方法。
$ docker container inspect <container-name>
2つのコンテナを立ち上げて通信させてみる。
$ docker container run -dt --name bridge01 ubuntu
339b2fc35742c6f3717229ca48d084588e299eb7aa3f79da5e1302d9d0048cef
$ docker container run -dt --name bridge02 ubuntu
7777104893f7019fdac58c2e153f6418b99b6111d077d587af407dcacfa543b8
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7777104893f7 ubuntu "/bin/bash" 30 seconds ago Up 28 seconds bridge02
339b2fc35742 ubuntu "/bin/bash" 50 seconds ago Up 48 seconds bridge01
48f7a1225f89 ubuntu "/bin/bash" 5 hours ago Up 5 hours myhost
8229282bc476 ubuntu "/bin/bash" 28 hours ago Up 28 hours my_ubuntu
e6e93cd9f5c5 5e4 "nginx -g 'daemon of…" 2 days ago Up 28 hours 0.0.0.0:8082->80/tcp, :::8082->80/tcp mycustomnginx
67df4d402280 nginx "/docker-entrypoint.…" 4 days ago Up 2 days 0.0.0.0:8080->80/tcp, :::8080->80/tcp mynginx
１台目のコンテナにログインしてみる。
$ docker container exec -it bridge01 bash
/# apt-get update && apt-get install net-tools && apt-get install iputils-ping
/# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1460
inet 172.17.0.5 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:ac:11:00:05 txqueuelen 0 (Ethernet)
RX packets 2607 bytes 26300516 (26.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2457 bytes 167530 (167.5 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
/# exit
２台目のコンテナにログインしてみる。
$ docker container exec -it bridge02 bash
/# apt-get update && apt-get install net-tools && apt-get install iputils-ping
/# ifconfig
2台目のコンテナから1台目のコンテナに ping してみる。
/# ping 172.17.0.5
ING 172.17.0.5 (172.17.0.5) 56(84) bytes of data.
64 bytes from 172.17.0.5: icmp_seq=1 ttl=64 time=0.105 ms
64 bytes from 172.17.0.5: icmp_seq=2 ttl=64 time=0.074 ms
64 bytes from 172.17.0.5: icmp_seq=3 ttl=64 time=0.067 ms
64 bytes from 172.17.0.5: icmp_seq=4 ttl=64 time=0.091 ms
64 bytes from 172.17.0.5: icmp_seq=5 ttl=64 time=0.087 ms
--- 172.17.0.5 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time
route table を確認する。
/# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.17.0.1 0.0.0.0 UG 0 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
引き続き、Google Cloud の Container optimized-os の Docker マシンで、以下のコマンドを確認する。
Container Optimized-os では、この、toolbox と言うコマンドを実行することにより、apt-get コマンドが使えて、パッケージがインストールできる。
$ toolbox
/# apt-get install bridge-utils
/# brctl showbridge name bridge id STP enabled interfaces
docker0 8000.02423d1ff74d no veth48a4c4e
veth9636e80
vethc072a2f
vethdedb2be
vethf7d8ca0
引き続き、Google Cloud の Container optimized-os の Docker マシンで、以下のコマンドを確認する。
$ docker network inspect bridge
[
{
"Name": "bridge",
"Id": "5e9118fc9ae3388d7311ad99eeec9140a5386381194d378941af2c39bbf8812f",
"Created": "2023-02-18T12:13:31.170443126Z",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.17.0.0/16",
"Gateway": "172.17.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"339b2fc35742c6f3717229ca48d084588e299eb7aa3f79da5e1302d9d0048cef": {
"Name": "bridge01",
"EndpointID": "54a7e979505a2d8b08d56e7607dcf71013951f8ff356b62c4e9dbeb045f5862e",
"MacAddress": "02:42:ac:11:00:05",
"IPv4Address": "172.17.0.5/16",
"IPv6Address": ""
},
"67df4d40228057e55850e67d3e9a3bff7ce51fc2a4bfcbefc6ba9b1dbd402942": {
"Name": "mynginx",
"EndpointID": "6595b6b7b116d05d442e73221424e520156427025452a46c32d32b4882799d42",
"MacAddress": "02:42:ac:11:00:02",
"IPv4Address": "172.17.0.2/16",
"IPv6Address": ""
},
"7777104893f7019fdac58c2e153f6418b99b6111d077d587af407dcacfa543b8": {
"Name": "bridge02",
"EndpointID": "75b5a1435e20d95cffd7d00bb063dbbc1a18ff212279208d5130722e4585aacd",
"MacAddress": "02:42:ac:11:00:06",
"IPv4Address": "172.17.0.6/16",
"IPv6Address": ""
},
"8229282bc476d6394eee8ad64ff9e9a40a3c678f6fef1ab060c21824c61514a0": {
"Name": "my_ubuntu",
"EndpointID": "3e094e4ff87e80616c80d1c14798108bfc65ea52c76ed3a670867d1ea36d6633",
"MacAddress": "02:42:ac:11:00:04",
"IPv4Address": "172.17.0.4/16",
"IPv6Address": ""
},
"e6e93cd9f5c5f5b3bc68e5e6fd068d5eb49585d53d46190249e8b141f1408664": {
"Name": "mycustomnginx",
"EndpointID": "065ba8c9c8c0157b60fec5af2a301f6d069c898a1e1ea8d1a48c71c17747c1bf",
"MacAddress": "02:42:ac:11:00:03",
"IPv4Address": "172.17.0.3/16",
"IPv6Address": ""
}
},
"Options": {
"com.docker.network.bridge.default_bridge": "true",
"com.docker.network.bridge.enable_icc": "true",
"com.docker.network.bridge.enable_ip_masquerade": "true",
"com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
"com.docker.network.bridge.name": "docker0",
"com.docker.network.driver.mtu": "1460"
},
"Labels": {}
}
]