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Explain how to use "network connect --driver-opt" to set sysctls 

Signed-off-by: Rob Murray <rob.murray@docker.com>
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Rob Murray 2024-05-08 16:01:29 +01:00
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docs/reference/commandline/network_connect.md
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@ -65,6 +65,26 @@ being connected to.
$ docker network connect --alias db --alias mysql multi-host-network container2 $ docker network connect --alias db --alias mysql multi-host-network container2
``` ```
### <a name="sysctl"></a> Set sysctls for a container's interface (--driver-opt)
`sysctl` settings that start with `net.ipv4.` and `net.ipv6.` can be set per-interface
using `--driver-opt` label `com.docker.network.endpoint.sysctls`. The name of the
interface must be replaced by `IFNAME`.
To set more than one `sysctl` for an interface, quote the whole value of the
`driver-opt` field, remembering to escape the quotes for the shell if necessary.
For example, if the interface to `my-net` is given name `eth3`, the following example
sets `net.ipv4.conf.eth3.log_martians=1` and `net.ipv4.conf.eth3.forwarding=0`.
```console
$ docker network connect --driver-opt=\"com.docker.network.endpoint.sysctls=net.ipv4.conf.IFNAME.log_martians=1,net.ipv4.conf.IFNAME.forwarding=0\" multi-host-network container2
```
> **Note**
>
> Network drivers may restrict the sysctl settings that can be modified and, to protect
> the operation of the network, new restrictions may be added in the future.
### Network implications of stopping, pausing, or restarting containers ### Network implications of stopping, pausing, or restarting containers
You can pause, restart, and stop containers that are connected to a network. You can pause, restart, and stop containers that are connected to a network.