systemd unit: make EnvironmentFile optional

Previously, k3s.service was failing when the EnvironmentFile does not exist: ``` Feb 02 17:17:30 suda-ws01 systemd[1]: k3s.service: Failed to load environment files: No such file or directory Feb 02 17:17:30 suda-ws01 systemd[1]: k3s.service: Failed to run 'start' task: No such file or directory Feb 02 17:17:30 suda-ws01 systemd[1]: k3s.service: Failed with result 'resources'. Feb 02 17:17:30 suda-ws01 systemd[1]: Failed to start Lightweight Kubernetes. ``` ref: https://unix.stackexchange.com/questions/404199/documentation-of-equals-minus-in-systemd-unit-filesSigned-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

systemd unit: make EnvironmentFile optional
732228fd · Akihiro Suda · Brad Davidson · 65c78cc3 · 732228fd
Commit 732228fd authored Feb 02, 2021 by Akihiro Suda Committed by Brad Davidson Feb 03, 2021
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k3s.service k3s.service +1 -1

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--- a/k3s.service
+++ b/k3s.service
@@ -6,7 +6,7 @@ Wants=network-online.target
 [Service]
 Type=notify
-EnvironmentFile=/etc/systemd/system/k3s.service.env
+EnvironmentFile=-/etc/systemd/system/k3s.service.env
 ExecStart=/usr/local/bin/k3s server
 KillMode=process
 Delegate=yes