Docker: The endpoint is probably not valid etcd cluster endpoint

[Dmitriy]

Hello. After fresh install I have problem with create container. (Centos 9, Zed)

zun.common.exception.DockerError: Docker internal error: 500 Server Error for http+docker://localhost/v1.26/networks/create: Internal Server Error ("failed to update store for object type *libnetwork.endpointCnt: client: response is invalid json. The endpoint is probably not valid etcd cluster endpoint.").#033[00m

[hanxiao (xiao0)]

You can try etcd enable v2 to accept etcd V2 client requests.

* Edit /usr/lib/systemd/system/etcd.service
```
[Service]
# ...
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --enable-v2=true"
```