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authorDaniel J Walsh <dwalsh@redhat.com>2018-12-24 08:42:40 -0500
committerDaniel J Walsh <dwalsh@redhat.com>2018-12-30 08:08:13 -0500
commitad36345fde0913a098b64d0c628f562134d1675b (patch)
treee87a117fa185f8d7402cbecc06dfbeb75320c7b9 /docs
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Add troubleshooting for sparse files
A common failure with people building container images is the creation of large sparse files, particularly useradd creating the lastlog file. This PR Documents the failures. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Diffstat (limited to 'docs')
-rw-r--r--docs/podman-build.1.md10
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diff --git a/docs/podman-build.1.md b/docs/podman-build.1.md
index f887d68cd..76e16b42c 100644
--- a/docs/podman-build.1.md
+++ b/docs/podman-build.1.md
@@ -614,8 +614,16 @@ $ podman build -f dev/Dockerfile https://10.10.10.1/podman/context.tar.gz
registries.conf is the configuration file which specifies which container registries should be consulted when completing image names which do not include a registry or domain portion.
+## Troubleshooting
+
+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 you are using `useradd` within your build script, you should pass the `--no-log-init or -l` option to the `useradd` command. This option tells useradd to stop creating the lastlog file.
+
## SEE ALSO
-podman(1), buildah(1), containers-registries.conf(5)
+podman(1), buildah(1), containers-registries.conf(5), useradd(8)
## HISTORY
May 2018, Minor revisions added by Joe Doss <joe@solidadmin.com>