> For the complete documentation index, see [llms.txt](https://protocol-labs.gitbook.io/testground/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://protocol-labs.gitbook.io/testground/master/table-of-contents/docker-settings.md).

# Docker Settings

Since the update to Linux Kernel 5.12.2, we can no longer modify the `net.netfilter.nf_conntrack_max` sys config programmatically via the Docker API. If you encounter any network related errors, please increase it to at least 120000.

### Linux

The value `vm_map_max_count` can be permanently changed in `/etc/sysctl.conf`:

```
$ grep vm.max_map_count /etc/sysctl.conf
vm.max_map_count=120000
```

You can also change it via:

```
sysctl -w vm.max_map_count=120000
```

### macOS via Docker for Mac

The value `vm_max_map_count` should be changed within the xhyve virtual machine:

```
$ screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty
```

Then, log in with *root* and no password and configure the `sysctl` setting:

```
sysctl -w vm.max_map_count=120000
```

### macOS via Docker Toolbox

The value `vm_max_map_count` can be changed  via docker-machine:

```
docker-machine ssh
sudo sysctl -w vm.max_map_count=120000
```


---

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