distribution/docs/insecure.md

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<!--[metadata]>
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title = "Docker Registry 2.0"
description = "Deploying an insecure Registry"
keywords = ["registry, images, repository"]
[menu.main]
parent="smn_registry"
+++
<![end-metadata]-->
# Insecure Registry
While it's highly recommended to secure your registry using a TLS certificate issued by a known CA, you may alternatively decide to use self-signed certificates, or even use your registry over plain http.
You have to understand the downsides in doing so, and the extra burden in configuration.
## Deploying a plain HTTP registry
> :warning: it's not possible to use an insecure registry with basic authentication
This basically tells Docker to entirely disregard security for your registry.
1. edit the file `/etc/default/docker` so that there is a line that reads: `DOCKER_OPTS="--insecure-registry myregistrydomain.com:5000"` (or add that to existing `DOCKER_OPTS`)
2. restart your Docker daemon: on ubuntu, this is usually `service docker stop && service docker start`
**Pros:**
- easy to configure
**Cons:**
- very insecure
- you have to configure every docker daemon that wants to access your registry
## Using self-signed certificates
> :warning: using this along with basic authentication requires to **also** trust the certificate into the OS cert store for some versions of docker
Generate your own certificate:
mkdir -p certs && openssl req \
-newkey rsa:4096 -nodes -sha256 -keyout certs/domain.key \
-x509 -days 365 -out certs/domain.crt
Be sure to use the name `myregistrydomain.com` as a CN.
Stop and restart your registry.
Then you have to instruct every docker daemon to trust that certificate. This is done by copying the `domain.crt` file to `/etc/docker/certs.d/myregistrydomain.com:5000/ca.crt` (don't forget to restart docker after doing so).
Stop and restart all your docker daemons.
**Pros:**
- more secure than the insecure registry solution
**Cons:**
- you have to configure every docker daemon that wants to access your registry
## Failing...
Failing to configure docker and trying to pull from a registry that is not using TLS will result in the following message:
```
FATA[0000] Error response from daemon: v1 ping attempt failed with error:
Get https://myregistrydomain.com:5000/v1/_ping: tls: oversized record received with length 20527.
If this private registry supports only HTTP or HTTPS with an unknown CA certificate,please add
`--insecure-registry myregistrydomain.com:5000` to the daemon's arguments.
In the case of HTTPS, if you have access to the registry's CA certificate, no need for the flag;
simply place the CA certificate at /etc/docker/certs.d/myregistrydomain.com:5000/ca.crt
```