Set the maximum number of open files in the systemd unit

This prevents IPFS reaching the limit (1024 by default), which is
treated like a low disk space threshold by ipfs and ipfs-cluster

templates/default/ipfs-cluster.systemd.service.erb

@@ -6,6 +6,8 @@ ExecStart=/usr/local/bin/ipfs-cluster-service daemon --upgrade
 User=ipfs
 Group=ipfs
 Restart=always
+# Raise the ulimit (max number of open files)
+LimitNOFILE=64000
 
 [Install]
 WantedBy=multi-user.target

templates/default/ipfs.systemd.service.erb

@@ -6,6 +6,8 @@ ExecStart=/usr/local/bin/ipfs daemon --migrate
 User=ipfs
 Group=ipfs
 Restart=always
+# Raise the ulimit (max number of open files)
+LimitNOFILE=64000
 
 [Install]
 WantedBy=multi-user.target