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diff --git a/troubleshooting.md b/troubleshooting.md index 030f0af7e..4649cccb3 100644 --- a/troubleshooting.md +++ b/troubleshooting.md @@ -127,3 +127,15 @@ To change its value you can use something like: `sysctl -w 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`. + +### 5) 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. |