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| author | Daniel J Walsh <dwalsh@redhat.com> | 2020-05-12 14:39:30 -0400 |
|---|---|---|
| committer | Daniel J Walsh <dwalsh@redhat.com> | 2020-05-19 15:34:45 -0400 |
| commit | e0a0d2fb0740d8695b423c22194edc6ef861b8ae (patch) | |
| tree | 8bdc16e2d4e78bf3284c313c4f2fe7d5628e1c72 /troubleshooting.md | |
| parent | 0f8ad039235137d086b9fea33bb74b362e625cdd (diff) | |
| download | podman-e0a0d2fb0740d8695b423c22194edc6ef861b8ae.tar.gz podman-e0a0d2fb0740d8695b423c22194edc6ef861b8ae.tar.bz2 podman-e0a0d2fb0740d8695b423c22194edc6ef861b8ae.zip | |
Update troubleshoot page
Add information about podman with SELinux and using container_init_t.
Add informantion about Centos7 as well as RHEL7 init containers not working
on a cgroups V2 system.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Diffstat (limited to 'troubleshooting.md')
| -rw-r--r-- | troubleshooting.md | 34 |
1 files changed, 25 insertions, 9 deletions
diff --git a/troubleshooting.md b/troubleshooting.md index f04d9e9fa..167ee14c3 100644 --- a/troubleshooting.md +++ b/troubleshooting.md @@ -219,8 +219,15 @@ the system. #### Solution -SELinux provides a boolean `container_manage_cgroup`, which allows container -processes to write to the cgroup file system. Turn on this boolean, on SELinux separated systems, to allow systemd to run properly in the container. +Newer versions of Podman (2.0 or greater) support running init based containers +with a different SELinux labels, which allow the container process access to the +cgroup file system. This feature requires container-selinux-2.132 or newer +versions. + +Prior to Podman 2.0, the SELinux boolean `container_manage_cgroup` allows +container processes to write to the cgroup file system. Turn on this boolean, +on SELinux separated systems, to allow systemd to run properly in the container. +Only do this on systems running older versions of Podman. `setsebool -P container_manage_cgroup true` @@ -240,7 +247,7 @@ cannot find newuidmap: exec: "newuidmap": executable file not found in $PATH #### Solution -Install a version of shadow-utils that includes these executables. Note RHEL7 and Centos 7 will not have support for this until RHEL7.7 is released. +Install a version of shadow-utils that includes these executables. Note RHEL 7 and CentOS 7 will not have support for this until RHEL7.7 is released. ### 11) rootless setup user: invalid argument @@ -424,9 +431,10 @@ Choose one of the following: * Install the fuse-overlayfs package for your Linux Distribution. * Add `mount_program = "/usr/bin/fuse-overlayfs"` under `[storage.options]` in your `~/.config/containers/storage.conf` file. -### 17) rhel7-init based images don't work with cgroups v2 +### 17) RHEL 7 and CentOS 7 based `init` images don't work with cgroup v2 -The systemd version shipped in rhel7-init doesn't have support for cgroups v2. You'll need at least systemd 230. +The systemd version shipped in RHEL 7 and CentOS 7 doesn't have support for cgroup v2. Support for cgroup V2 requires version 230 of systemd or newer, which +was never shipped or supported on RHEL 7 or CentOS 7. #### Symptom ```console @@ -440,7 +448,15 @@ Error: non zero exit code: 1: OCI runtime error #### Solution You'll need to either: -* configure the host to use cgroups v1 +* configure the host to use cgroup v1 + +``` +On Fedora you can do: +# dnf install -y grubby +# grubby --update-kernel=ALL --args=âsystemd.unified_cgroup_hierarchy=0" +# reboot +``` + * update the image to use an updated version of systemd. ### 18) rootless containers exit once the user session exits @@ -483,7 +499,7 @@ Unable to pull images ```console $ podman unshare cat /proc/self/uid_map - 0 1000 1 + 0 1000 1 ``` #### Solution @@ -496,8 +512,8 @@ Original command now returns ``` $ podman unshare cat /proc/self/uid_map - 0 1000 1 - 1 100000 65536 + 0 1000 1 + 1 100000 65536 ``` Reference [subuid](http://man7.org/linux/man-pages/man5/subuid.5.html) and [subgid](http://man7.org/linux/man-pages/man5/subgid.5.html) man pages for more detail. |