The daemon configuration is under etc/docker/daemon.json, which just uses the config from the Linux configuration file. You need to change the config and then do a git commit: docker should restart automatically at that point (if not, restart it) with the new configuration. Test an insecure registry Estimated reading time: 4 minutes While it’s highly recommended to secure your registry using a TLS certificate issued by a known CA, you can choose to use self-signed certificates, or use your registry over an unencrypted HTTP connection. Either of these choices involves security trade-offs and additional configuration steps. Deploy a plain HTTP registry Warning: It’s not possible to use an insecure registry with basic authentication. This procedure configures Docker to entirely disregard security for your registry. This is very insecure and is not recommended. It exposes your registry to trivial man-in-the-middle (MITM) attacks. Only use this solution for isolated testing or in a tightly controlled, air-gapped environment. • Edit the daemon.json file, whose default location is /etc/docker/daemon.json on Linux or C: ProgramData docker config daemon.json on Windows Server. If you use Docker Desktop for Mac or Docker Desktop for Windows, click the Docker icon, choose Preferences, and choose + Daemon. If the daemon.json file does not exist, create it. Assuming there are no other settings in the file, it should have the following contents. $ 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. • Use the result to. • Instruct every Docker daemon to trust that certificate. The way to do this depends on your OS. • Linux: Copy the domain.crt file to /etc/docker/certs.d/myregistrydomain.com:5000/ca.crt on every Docker host. You do not need to restart Docker. • Windows Server: • Open Windows Explorer, right-click the domain.crt file, and choose Install certificate. When prompted, select the following options: Store location local machine Place all certificates in the following store selected • Click Browser and select Trusted Root Certificate Authorities. • Click Finish. Restart Docker. • Docker Desktop for Mac: Follow the instructions on. Restart Docker. • Docker Desktop for Windows: Follow the instructions on. Restart Docker. Troubleshoot insecure registry This section lists some common failures and how to recover from them. Failing to configure the Engine daemon and trying to pull from a registry that is not using TLS results in the following message: FATA[0000] Error response from daemon: v1 ping attempt failed with error: Get tls: oversized record received with length 20527. If this private registry supports only HTTP or HTTPS with an unknown CA certificate, 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 Docker still complains about the certificate when using authentication? When using authentication, some versions of Docker also require you to trust the certificate at the OS level. ![]() Updated on April 13th, 2018 in Docker Tip #50: Running an Insecure Docker Registry Running an insecure registry isn't recommended but sometimes it's the easiest and most reasonable solution. Here's how to do it. You should attempt to protect your registry with SSL certificates but I get it, the real world happens and sometimes you’re in a pinch to get something to work. But before we continue, please understand that anyone can sniff your traffic in between your registry and your box(es) if it’s not secured by TLS. Basic idea for setting it up: You’ll need to configure both the Docker daemon running your registry and any Docker daemons that plan to interact with that registry by white listing your insecure registry. On Ubuntu 14.x: You’ll need to edit the DOCKER_OPTS in your /etc/default/docker file. For example, you’ll want to make it look similar to this: DOCKER_OPTS='--insecure-registry registry.example.com -H tcp://127.0.0.1:2375 -H unix:///var/run/docker.sock' for a registry running on port 80 on example.com. E viewer for mac. • Use the Shapes tool to add shapes like rectangles, ovals, lines, and arrows. • Choose an attachment, then click Choose File. • Click the menu icon that appears in the upper-right corner of the attachment, then choose Markup. These are some of the markup tools available: • Use the Sketch tool to create freehand drawings.
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