Reduce the memory usage of go-ipfs

Lower the number of connections, change the routing mode to dhtclient,
and disable bandwidth metrics. This is hardcoded for now

recipes/default.rb

@@ -83,3 +83,26 @@ end
 ipfs_config 'Swarm.AddrFilters' do
   value node['ipfs']['config']['swarm']['addr_filter']
 end
+
+# Do not keep track of bandwidth metrics. Disabling bandwidth metrics can
+# lead to a slight performance improvement, as well as a reduction in memory
+# usage.
+ipfs_config 'Swarm.DisableBandwidthMetrics' do
+  value true
+end
+
+# Disable the p2p-circuit relay transport
+ipfs_config 'Swarm.DisableRelay' do
+  value true
+end
+
+# Number of connections that, when exceeded, will trigger a connection GC
+# operation
+ipfs_config 'Swarm.ConnMgr.HighWater' do
+  value 10
+end
+
+# Minimum number of connections to maintain
+ipfs_config 'Swarm.ConnMgr.LowWater' do
+  value 1
+end

templates/default/ipfs.systemd.service.erb

@@ -2,12 +2,14 @@
 Description=Start ipfs
 
 [Service]
-ExecStart=/usr/local/bin/ipfs daemon --migrate
+ExecStart=/usr/local/bin/ipfs daemon --migrate --routing=dhtclient
 User=ipfs
 Group=ipfs
 Restart=always
 # Raise the ulimit (max number of open files)
 LimitNOFILE=64000
+# Limit the memory usage to 256MB
+MemoryMax=256M
 
 [Install]
 WantedBy=multi-user.target