Ignore modprobe failures in ExecStartPre (systemd unit)

When running containerd inside LXC, due to systemd being unable to execute `modprobe overlay` inside the container (module is already loaded in host kernel). This patch adds a `-` prefix to the `ExecStartPre` command, so that failures are ignored, and the service can start as usual. Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit 555ea3f) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
containerd · Nov 10, 2018 · 36d2576 · 36d2576
1 parent b337430
commit 36d2576
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diff --git a/containerd.service b/containerd.service
@@ -4,7 +4,7 @@ Documentation=https://containerd.io
 After=network.target
 
 [Service]
-ExecStartPre=/sbin/modprobe overlay
+ExecStartPre=-/sbin/modprobe overlay
 ExecStart=/usr/local/bin/containerd
 Delegate=yes
 KillMode=process

diff --git a/docs/ops.md b/docs/ops.md
@@ -49,7 +49,7 @@ Documentation=https://containerd.io
 After=network.target
 
 [Service]
-ExecStartPre=/sbin/modprobe overlay
+ExecStartPre=-/sbin/modprobe overlay
 ExecStart=/usr/local/bin/containerd
 Delegate=yes
 KillMode=process