![PODMAN logo](logo/podman-logo-source.svg) # Troubleshooting ## A list of common issues and solutions for Podman --- ### 1) Variety of issues - Validate Version A large number of issues reported against Podman are often found to already be fixed in more current versions of the project. Before reporting an issue, please verify the version you are running with `podman version` and compare it to the lastest release documented on the top of Podman's [README.md](README.md). If they differ, please update your version of PODMAN to the latest possible and retry your command before reporting the issue. --- ### 2) No such image or Bare keys cannot contain ':' When doing a `podman pull` or `podman build` command and a "common" image cannot be pulled, it is likely that the `/etc/containers/registries.conf` file is either not installed or possibly misconfigured. #### Symptom ```console $ sudo podman build -f Dockerfile STEP 1: FROM alpine error building: error creating build container: no such image "alpine" in registry: image not known ``` or ```console $ sudo podman pull fedora error pulling image "fedora": unable to pull fedora: error getting default registries to try: Near line 9 (last key parsed ''): Bare keys cannot contain ':'. ``` #### Solution * Verify that the `/etc/containers/registries.conf` file exists. If not, verify that the skopeo-containers package is installed. * Verify that the entries in the `[registries.search]` section of the /etc/containers/registries.conf file are valid and reachable. * i.e. `registries = ['registry.fedoraproject.org', 'quay.io', 'registry.access.redhat.com']` --- ### 3) http: server gave HTTP response to HTTPS client When doing a Podman command such as `build`, `commit`, `pull`, or `push` to a registry, tls verification is turned on by default. If authentication is not used with those commands, this error can occur. #### Symptom ```console $ sudo podman push alpine docker://localhost:5000/myalpine:latest Getting image source signatures Get https://localhost:5000/v2/: http: server gave HTTP response to HTTPS client ``` #### Solution By default tls verification is turned on when communicating to registries from Podman. If the registry does not require authentication the Podman commands such as `build`, `commit`, `pull` and `push` will fail unless tls verification is turned off using the `--tls-verify` option. **NOTE:** It is not at all recommended to communicate with a registry and not use tls verification. * Turn off tls verification by passing false to the tls-verification option. * I.e. `podman push --tls-verify=false alpine docker://localhost:5000/myalpine:latest` --- ### 4) Rootless: could not get runtime - database configuration mismatch In Podman release 0.11.1, a default path for rootless containers was changed, potentially causing rootless Podman to be unable to function. The new default path is not a problem for new installations, but existing installations will need to work around it with the following fix. #### Symptom ```console $ podman info could not get runtime: database run root /run/user/1000/run does not match our run root /run/user/1000: database configuration mismatch ``` #### Solution This problem has been fixed in Podman release 0.12.1 and it is recommended to upgrade to that version. If that is not possible use the following procedure. To work around the new default path, we can manually set the path Podman is expecting in a configuration file. First, we need to make a new local configuration file for rootless Podman. * `mkdir -p ~/.config/containers` * `cp /usr/share/containers/libpod.conf ~/.config/containers` Next, edit the new local configuration file (`~/.config/containers/libpod.conf`) with your favorite editor. Comment out the line starting with `cgroup_manager` by adding a `#` character at the beginning of the line, and change the path in the line starting with `tmp_dir` to point to the first path in the error message Podman gave (in this case, `/run/user/1000/run`). --- ### 5) rootless containers cannot ping hosts When using the ping command from a non-root container, the command may fail because of a lack of privileges. #### Symptom ```console $ podman run --rm fedora ping -W10 -c1 redhat.com PING redhat.com (209.132.183.105): 56 data bytes --- redhat.com ping statistics --- 1 packets transmitted, 0 packets received, 100% packet loss ``` #### Solution It is most likely necessary to enable unprivileged pings on the host. Be sure the UID of the user is part of the range in the `/proc/sys/net/ipv4/ping_group_range` file. To change its value you can use something like: `sysctl -w "net.ipv4.ping_group_range=0 2000000"`. To make the change persistent, you'll need to add a file in `/etc/sysctl.d` that contains `net.ipv4.ping_group_range=0 $MAX_UID`. --- ### 6) Build hangs when the Dockerfile contains the useradd command When the Dockerfile contains a command like `RUN useradd -u 99999000 -g users newuser` the build can hang. #### Symptom If you are using a useradd command within a Dockerfile with a large UID/GID, it will create a large sparse file `/var/log/lastlog`. This can cause the build to hang forever. Go language does not support sparse files correctly, which can lead to some huge files being created in your container image. #### Solution If the entry in the Dockerfile looked like: RUN useradd -u 99999000 -g users newuser then add the `--log-no-init` parameter to change it to: `RUN useradd --log-no-init -u 99999000 -g users newuser`. This option tells useradd to stop creating the lastlog file.