Hello, I think systemd sets the pid file with root:root, but requested is munin:root.
:/run/munin$ ls -l insgesamt 4 -rw-r--r-- 1 root root 6 Feb 2 07:49 munin-node.pid CU Jörg -- New: GPG Fingerprint: 63E0 075F C8D4 3ABB 35AB 30EE 09F8 9F3C 8CA1 D25D GPG key (long) : 09F89F3C8CA1D25D GPG Key : 8CA1D25D CAcert Key S/N : 0E:D4:56 Old pgp Key: BE581B6E (revoked since 2014-12-31). Jörg Frings-Fürst D-54470 Lieser Threema: SYR8SJXB Wire: @joergfringsfuerst Skype: joergpenguin Ring: jff Telegram: @joergfringsfuerst IRC: j_...@freenode.net j_...@oftc.net My wish list: - Please send me a picture from the nature at your home.