Docker Networking Tutorial
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Docker makes it fairly easy to set up virtual networking in a local environment. In fact, in using Docker to this point, we haven’t had the need to tinker with any network settings as typically the network portion of Docker “Just Works”. In other words, the defaults provided are common to work with but you can change any of the default options with regard to networks under the hood. Most of the networking in Docker revolves around the ports in use and how to expose those ports for various services in containers. Most times, the bridge default virtual network is used but we’ll see how to create, connect to, and disconnect from additional networks as needed.
Mục Lục
Docker Network Defaults
Some of the defaults when working with Docker Networks are as follows.
- Each container is connected to a private virtual network named bridge.
- Each virtual network routes through the NAT on the host IP.
- All containers on the same virtual network can talk to each other with no need for exposing ports (-p)
- The defaults work well in most cases but can be customized if needed.
- You can create networks as needed, or use the host IP (–net=host)
- You can attach containers to any number of networks, or none if you don’t need any.
Docker Network Ports
The first thing we’ll look at when networking with Docker is the -p option. This option flag is short for –publish, which creates a firewall rule which maps a port on the container to a port on the host machine to the outside world. In the following example, an Nginx container is started with the name of webhost. The flag in bold -p 80:80, specifes to map TCP port 80 in the container to port 80 on the host. Publishing ports is in the format of HOST:CONTAINER.
> dockercontainer
run -p 80:80 --name webhost -d nginx c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd
The docker container port command shows us in a nice format which ports are forwarding traffic from the host to the container.
> dockercontainer
port webhost 80/tcp -> 0.0.0.0:80
Docker IP Addressing
To find the IP Address of a container, we can use the docker container inspect command. In the example here we are using the –format option to format the results of our command in a user friendly way. Our webhost container has the IP address of 172.17.0.2 as we can see.
> dockercontainer
inspect --format '{{ .NetworkSettings.IPAddress }}' webhost 172.17.0.2
Listing Docker Networks
The docker network ls command shows all of the networks that have been created. The bridge network is the default docker virtual network which is behind NAT’d behind the host IP Address. The host network skips virtual networks altogether for performance reasons, but is less secure. The none network can be thought of like a network port that is unplugged.
> dockernetwork
ls NETWORK ID NAME DRIVER SCOPE 313d57da9944 bridge bridge local 4c835cce5ea0 host host local 085638da5c3d none null local
Inspecting Docker Networks
We can use the docker network inspect command to find out what containers are connected to what network. The output below shows us that the webhost container which has an IP address of 172.17.0.2 and a subnet mask of 16 bits, is connected to the bridge network. Docker networks automatically assign IP addresses, and the configuration of that is handled in the IPAM section.
> dockernetwork
inspect bridge [ { "Name": "bridge", "Id": "313d57da9944030d011fc7f86938007a67aa2c201f3642db3ad4b86f1560cf2e", "Created": "2020-10-05T12:54:39.6042375Z", "Scope": "local", "Driver": "bridge", "EnableIPv6": false, "IPAM": { "Driver": "default", "Options": null, "Config": [ { "Subnet": "172.17.0.0/16", "Gateway": "172.17.0.1" } }, "Attachable": false, "Ingress": false, "ConfigFrom": { "Network": "" }, "Containers": { "c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd": { "Name": "webhost", "EndpointID": "2e6f46886aae647928688b3ca8b3cf9894a2cf40e99cf0bc92dec05a2e3399a7", "MacAddress": "02:42:ac:11:00:02", "IPv4Address": "172.17.0.2/16", "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": "1500" }, "Labels": {} } ]
Create A Docker Network
To create a virtual network in Docker, use the docker network create command and pass it the name you would like the network to have. This creates a new virtual network that you can attach containers to.
> dockernetwork
create my_network 66e9d0a4537bf8a8b6771720f5226ce809ca8ac7ecb1e5ba66a36df6068c7194
Now when we list out the networks again, there is a new entry with the name of my_network and the driver of bridge. The bridge driver is the default driver that creates a virtual network for you with sensible defaults beginning at 172.17.
> docker network ls NETWORK ID NAME DRIVER SCOPE 313d57da9944 bridge bridge local 4c835cce5ea0 host host local 66e9d0a4537b my_network bridge local 085638da5c3d none null local
If you needed to customize the settings for your virtual network, the –help menu gives you an overview of what can be configured.
> dockernetwork
create --help Usage: docker network create [OPTIONS] NETWORK Create a network Options: --attachable Enable manual container attachment --aux-address map Auxiliary IPv4 or IPv6 addresses used by Network driver (default map[]) --config-from string The network from which copying the configuration --config-only Create a configuration only network -d, --driver string Driver to manage the Network (default "bridge") --gateway strings IPv4 or IPv6 Gateway for the master subnet --ingress Create swarm routing-mesh network --internal Restrict external access to the network --ip-range strings Allocate container ip from a sub-range --ipam-driver string IP Address Management Driver (default "default") --ipam-opt map Set IPAM driver specific options (default map[]) --ipv6 Enable IPv6 networking --label list Set metadata on a network -o, --opt map Set driver specific options (default map[]) --scope string Control the network's scope --subnet strings Subnet in CIDR format that represents a network segment
Connecting Containers To Networks
When you spin up a container, you can specify the network it will connect to if you like. Below we are spinning up a second webhost named webhost2, and we are assigning it to the new network that we just created named my_network.
> dockercontainer
run -d --name webhost2 --network my_network nginx 40c5fe69890498159920ec5a775eb3583289253372bfdf5c63f4e32a3db5ab31
When inspecting the my_network network, we see that container connected to the network successfully.
> dockernetwork
inspect my_network [ { "Name": "my_network", "Id": "66e9d0a4537bf8a8b6771720f5226ce809ca8ac7ecb1e5ba66a36df6068c7194", "Created": "2020-10-05T15:10:43.1263348Z", "Scope": "local", "Driver": "bridge", "EnableIPv6": false, "IPAM": { "Config": [ { "Subnet": "172.18.0.0/16", "Gateway": "172.18.0.1" } ] }, "Internal": false, "Attachable": false, "Ingress": false, "ConfigFrom": { "Network": "" }, "ConfigOnly": false, "Containers": { "40c5fe69890498159920ec5a775eb3583289253372bfdf5c63f4e32a3db5ab31": { "Name": "webhost2", "EndpointID": "265a958fff7085094f4497c7cc34d933685708f5ea434700f28e981dcd475257", "MacAddress": "02:42:ac:12:00:02", "IPv4Address": "172.18.0.2/16", "IPv6Address": "" } }, "Options": {}, "Labels": {} } ]
Now, let’s also connect the original container we had running to this new network. This can be done with the docker network connect command.
> dockernetwork
connect my_network webhost
Now when we inspect that container, it shows that it is connected to 2 networks. It is connected to bridge, as well as my_network.
> dockercontainer
inspect webhost [ { "Id": "c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd", "Created": "2020-10-05T14:54:15.1858603Z", "Path": "/docker-entrypoint.sh", "Args": [ "nginx", "-g", "daemon off;" ], "State": { "Status": "running", "Running": true, "Paused": false, "Restarting": false, "OOMKilled": false, "Dead": false, "Pid": 816, "ExitCode": 0, "Error": "", "StartedAt": "2020-10-05T14:54:16.1634567Z", "FinishedAt": "0001-01-01T00:00:00Z" }, "Image": "sha256:7e4d58f0e5f3b60077e9a5d96b4be1b974b5a484f54f9393000a99f3b6816e3d", "ResolvConfPath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/resolv.conf", "HostnamePath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/hostname", "HostsPath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/hosts", "LogPath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd-json.log", "Name": "/webhost", "RestartCount": 0, "Driver": "overlay2", "Platform": "linux", "MountLabel": "", "ProcessLabel": "", "AppArmorProfile": "", "ExecIDs": null, "HostConfig": { "Binds": null, "ContainerIDFile": "", "LogConfig": { "Type": "json-file", "Config": {} }, "NetworkMode": "default", "PortBindings": { "80/tcp": [ { "HostIp": "", "HostPort": "80" } ] }, "RestartPolicy": { "Name": "no", "MaximumRetryCount": 0 }, "AutoRemove": false, "VolumeDriver": "", "VolumesFrom": null, "CapAdd": null, "CapDrop": null, "Capabilities": null, "Dns": [], "DnsOptions": [], "DnsSearch": [], "ExtraHosts": null, "GroupAdd": null, "IpcMode": "private", "Cgroup": "", "Links": null, "OomScoreAdj": 0, "PidMode": "", "Privileged": false, "PublishAllPorts": false, "ReadonlyRootfs": false, "SecurityOpt": null, "UTSMode": "", "UsernsMode": "", "ShmSize": 67108864, "Runtime": "runc", "ConsoleSize": [ 30, 120 ], "Isolation": "", "CpuShares": 0, "Memory": 0, "NanoCpus": 0, "CgroupParent": "", "BlkioWeight": 0, "BlkioWeightDevice": [], "BlkioDeviceReadBps": null, "BlkioDeviceWriteBps": null, "BlkioDeviceReadIOps": null, "BlkioDeviceWriteIOps": null, "CpuPeriod": 0, "CpuQuota": 0, "CpuRealtimePeriod": 0, "CpuRealtimeRuntime": 0, "CpusetCpus": "", "CpusetMems": "", "Devices": [], "DeviceCgroupRules": null, "DeviceRequests": null, "KernelMemory": 0, "KernelMemoryTCP": 0, "MemoryReservation": 0, "MemorySwap": 0, "MemorySwappiness": null, "OomKillDisable": false, "PidsLimit": null, "Ulimits": null, "CpuCount": 0, "CpuPercent": 0, "IOMaximumIOps": 0, "IOMaximumBandwidth": 0, "MaskedPaths": [ "/proc/asound", "/proc/acpi", "/proc/kcore", "/proc/keys", "/proc/latency_stats", "/proc/timer_list", "/proc/timer_stats", "/proc/sched_debug", "/proc/scsi", "/sys/firmware" ], "ReadonlyPaths": [ "/proc/bus", "/proc/fs", "/proc/irq", "/proc/sys", "/proc/sysrq-trigger" ] }, "GraphDriver": { "Data": { "LowerDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97-init/diff:/var/lib/docker/overlay2/b873da3ee35fed4ed5b663d42705f29857e467ef7fc70d4f01b34e8593c90a2d/diff:/var/lib/docker/overlay2/c37b3ca864167a02502bc473d368823bdf2fdddf7ef3ff0fda126aae98ccf5c3/diff:/var/lib/docker/overlay2/d0b819fd09a7a62a2fc9858b4a015cd5594a240caefce77cad9a6b0f596f0dca/diff:/var/lib/docker/overlay2/5d3260b5420b271959560369b58594ca2be7fd8ae7bd74822c24c765c8ebeafc/diff:/var/lib/docker/overlay2/d874cfda684973a0d7f77e451987cd726723eab53aabf2ef285000ff32101e3d/diff", "MergedDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97/merged", "UpperDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97/diff", "WorkDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97/work" }, "Name": "overlay2" }, "Mounts": [], "Config": { "Hostname": "c4198f018c0b", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "ExposedPorts": { "80/tcp": {} }, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "NGINX_VERSION=1.19.2", "NJS_VERSION=0.4.3", "PKG_RELEASE=1~buster" ], "Cmd": [ "nginx", "-g", "daemon off;" ], "Image": "nginx", "Volumes": null, "WorkingDir": "", "Entrypoint": [ "/docker-entrypoint.sh" ], "OnBuild": null, "Labels": { "maintainer": "NGINX Docker Maintainers <[email protected]>" }, "StopSignal": "SIGTERM" }, "NetworkSettings": { "Bridge": "", "SandboxID": "753e34a80acb2c9bcbb47344ef1a9ad7815d59e8151bfc61d84f1ee5d8f390d6", "HairpinMode": false, "LinkLocalIPv6Address": "", "LinkLocalIPv6PrefixLen": 0, "Ports": { "80/tcp": [ { "HostIp": "0.0.0.0", "HostPort": "80" } ] }, "SandboxKey": "/var/run/docker/netns/753e34a80acb", "SecondaryIPAddresses": null, "SecondaryIPv6Addresses": null, "EndpointID": "2e6f46886aae647928688b3ca8b3cf9894a2cf40e99cf0bc92dec05a2e3399a7", "Gateway": "172.17.0.1", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "IPAddress": "172.17.0.2", "IPPrefixLen": 16, "IPv6Gateway": "", "MacAddress": "02:42:ac:11:00:02", "Networks": { "bridge": { "IPAMConfig": null, "Links": null, "Aliases": null, "NetworkID": "313d57da9944030d011fc7f86938007a67aa2c201f3642db3ad4b86f1560cf2e", "EndpointID": "2e6f46886aae647928688b3ca8b3cf9894a2cf40e99cf0bc92dec05a2e3399a7", "Gateway": "172.17.0.1", "IPv6Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "MacAddress": "02:42:ac:11:00:02", "DriverOpts": null }, "my_network": { "IPAMConfig": {}, "Links": null, "Aliases": [ "c4198f018c0b" ], "NetworkID": "66e9d0a4537bf8a8b6771720f5226ce809ca8ac7ecb1e5ba66a36df6068c7194", "EndpointID": "117ac3c34ccf85838684684b61b93848455c4be8b6685833f15b81b88d09813d", "Gateway": "172.18.0.1", "IPAddress": "172.18.0.3", "IPPrefixLen": 16, "IPv6Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "MacAddress": "02:42:ac:12:00:03", "DriverOpts": {} } } } } ]
Remove Container From A Network
To remove a container from a network, use the docker container disconnect command. The example here disconnects the webhost container from the my_network network.
> dockernetwork
disconnect my_network webhost
An inspection confirms that this container is no longer connected to both networks. It only has the connection to the original bridge network now.
> dockercontainer
inspect webhost [ { "Id": "c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd", "Created": "2020-10-05T14:54:15.1858603Z", "Path": "/docker-entrypoint.sh", "Args": [ "nginx", "-g", "daemon off;" ], "State": { "Status": "running", "Running": true, "Paused": false, "Restarting": false, "OOMKilled": false, "Dead": false, "Pid": 816, "ExitCode": 0, "Error": "", "StartedAt": "2020-10-05T14:54:16.1634567Z", "FinishedAt": "0001-01-01T00:00:00Z" }, "Image": "sha256:7e4d58f0e5f3b60077e9a5d96b4be1b974b5a484f54f9393000a99f3b6816e3d", "ResolvConfPath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/resolv.conf", "HostnamePath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/hostname", "HostsPath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/hosts", "LogPath": "/var/lib/docker/containers/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd/c4198f018c0b90df3b5958bb892f015bc5afdeb8efba863a1439e8ad6c32ccfd-json.log", "Name": "/webhost", "RestartCount": 0, "Driver": "overlay2", "Platform": "linux", "MountLabel": "", "ProcessLabel": "", "AppArmorProfile": "", "ExecIDs": null, "HostConfig": { "Binds": null, "ContainerIDFile": "", "LogConfig": { "Type": "json-file", "Config": {} }, "NetworkMode": "default", "PortBindings": { "80/tcp": [ { "HostIp": "", "HostPort": "80" } ] }, "RestartPolicy": { "Name": "no", "MaximumRetryCount": 0 }, "AutoRemove": false, "VolumeDriver": "", "VolumesFrom": null, "CapAdd": null, "CapDrop": null, "Capabilities": null, "Dns": [], "DnsOptions": [], "DnsSearch": [], "ExtraHosts": null, "GroupAdd": null, "IpcMode": "private", "Cgroup": "", "Links": null, "OomScoreAdj": 0, "PidMode": "", "Privileged": false, "PublishAllPorts": false, "ReadonlyRootfs": false, "SecurityOpt": null, "UTSMode": "", "UsernsMode": "", "ShmSize": 67108864, "Runtime": "runc", "ConsoleSize": [ 30, 120 ], "Isolation": "", "CpuShares": 0, "Memory": 0, "NanoCpus": 0, "CgroupParent": "", "BlkioWeight": 0, "BlkioWeightDevice": [], "BlkioDeviceReadBps": null, "BlkioDeviceWriteBps": null, "BlkioDeviceReadIOps": null, "BlkioDeviceWriteIOps": null, "CpuPeriod": 0, "CpuQuota": 0, "CpuRealtimePeriod": 0, "CpuRealtimeRuntime": 0, "CpusetCpus": "", "CpusetMems": "", "Devices": [], "DeviceCgroupRules": null, "DeviceRequests": null, "KernelMemory": 0, "KernelMemoryTCP": 0, "MemoryReservation": 0, "MemorySwap": 0, "MemorySwappiness": null, "OomKillDisable": false, "PidsLimit": null, "Ulimits": null, "CpuCount": 0, "CpuPercent": 0, "IOMaximumIOps": 0, "IOMaximumBandwidth": 0, "MaskedPaths": [ "/proc/asound", "/proc/acpi", "/proc/kcore", "/proc/keys", "/proc/latency_stats", "/proc/timer_list", "/proc/timer_stats", "/proc/sched_debug", "/proc/scsi", "/sys/firmware" ], "ReadonlyPaths": [ "/proc/bus", "/proc/fs", "/proc/irq", "/proc/sys", "/proc/sysrq-trigger" ] }, "GraphDriver": { "Data": { "LowerDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97-init/diff:/var/lib/docker/overlay2/b873da3ee35fed4ed5b663d42705f29857e467ef7fc70d4f01b34e8593c90a2d/diff:/var/lib/docker/overlay2/c37b3ca864167a02502bc473d368823bdf2fdddf7ef3ff0fda126aae98ccf5c3/diff:/var/lib/docker/overlay2/d0b819fd09a7a62a2fc9858b4a015cd5594a240caefce77cad9a6b0f596f0dca/diff:/var/lib/docker/overlay2/5d3260b5420b271959560369b58594ca2be7fd8ae7bd74822c24c765c8ebeafc/diff:/var/lib/docker/overlay2/d874cfda684973a0d7f77e451987cd726723eab53aabf2ef285000ff32101e3d/diff", "MergedDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97/merged", "UpperDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97/diff", "WorkDir": "/var/lib/docker/overlay2/c443ff100dfbc9cb2f5b0618b35d4f8f6db3bbc06afb1889a3ba7f80f778ee97/work" }, "Name": "overlay2" }, "Mounts": [], "Config": { "Hostname": "c4198f018c0b", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "ExposedPorts": { "80/tcp": {} }, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "NGINX_VERSION=1.19.2", "NJS_VERSION=0.4.3", "PKG_RELEASE=1~buster" ], "Cmd": [ "nginx", "-g", "daemon off;" ], "Image": "nginx", "Volumes": null, "WorkingDir": "", "Entrypoint": [ "/docker-entrypoint.sh" ], "OnBuild": null, "Labels": { "maintainer": "NGINX Docker Maintainers <[email protected]>" }, "StopSignal": "SIGTERM" }, "NetworkSettings": { "Bridge": "", "SandboxID": "753e34a80acb2c9bcbb47344ef1a9ad7815d59e8151bfc61d84f1ee5d8f390d6", "HairpinMode": false, "LinkLocalIPv6Address": "", "LinkLocalIPv6PrefixLen": 0, "Ports": { "80/tcp": [ { "HostIp": "0.0.0.0", "HostPort": "80" } ] }, "SandboxKey": "/var/run/docker/netns/753e34a80acb", "SecondaryIPAddresses": null, "SecondaryIPv6Addresses": null, "EndpointID": "2e6f46886aae647928688b3ca8b3cf9894a2cf40e99cf0bc92dec05a2e3399a7", "Gateway": "172.17.0.1", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "IPAddress": "172.17.0.2", "IPPrefixLen": 16, "IPv6Gateway": "", "MacAddress": "02:42:ac:11:00:02", "Networks": { "bridge": { "IPAMConfig": null, "Links": null, "Aliases": null, "NetworkID": "313d57da9944030d011fc7f86938007a67aa2c201f3642db3ad4b86f1560cf2e", "EndpointID": "2e6f46886aae647928688b3ca8b3cf9894a2cf40e99cf0bc92dec05a2e3399a7", "Gateway": "172.17.0.1", "IPAddress": "172.17.0.2", "IPPrefixLen": 16, "IPv6Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "MacAddress": "02:42:ac:11:00:02", "DriverOpts": null } } } } ]
Learn More
Docker Networking Tutorial Summary
Listed below are some of the commands we had a look at in this docker networking tutorial. We can see how to create, list, inspect, connect to, and disconnect from virtual networks in a Docker environment.
- docker network ls – Lists all the networks the Engine daemon knows about. This includes the networks that span across multiple hosts in a cluster.
- docker network inspect – Returns information about one or more networks. By default, this command renders all results in a JSON object.
- docker network create – Creates a new network. The DRIVER accepts bridge or overlay which are the built-in network drivers. If you have installed a third party or your own custom network driver you can specify that DRIVER here also. If you don’t specify the –driver option, the command automatically creates a bridge network for you.
- docker network connect – Connects a container to a network. You can connect a container by name or by ID. Once connected, the container can communicate with other containers in the same network.
- docker network disconnect – Disconnects a container from a network. The container must be running to disconnect it from the network.
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