[DOC] fix userrights instructions and add update to INSTALL.md (#88)

INSTALL.md

@@ -10,7 +10,7 @@ rm go1.8.linux-amd64.tar.gz
 ```
 
 ### Configure go
-Add these lines in your root shell startup file (i.e. `/root/.bashrc`):
+Add these lines in your root shell startup file (e.g. `/root/.bashrc`):
 ```sh
 export GOPATH=/opt/go
 export PATH=$PATH:/usr/local/go/bin:$GOPATH/bin
@@ -42,10 +42,12 @@ cp /opt/go/src/github.com/FreifunkBremen/yanic/config_example.toml /etc/yanic.co
 For an easy startup you only need to edit the `interfaces` in section
 `[respondd]` in file `/etc/yanic.conf`.  
 
-Then create the following folders:
+Then create the following files and folders:
 ```sh
 mkdir -p /var/lib/yanic
 mkdir -p /var/www/html/meshviewer/data
+touch /var/log/yanic.log
+chown yanic /var/log/yanic.log /var/lib/yanic /var/www/html/meshviewer/data
 ```
 
 #### Standalone
@@ -62,9 +64,20 @@ the same directory as the `dataPath`. Change the path in the section
 `[[nodes.output.meshviewer]]` accordingly.
 
 ### Service
-```bash
+```sh
 cp /opt/go/src/github.com/FreifunkBremen/yanic/contrib/init/linux-systemd/yanic.service /lib/systemd/system/
 systemctl daemon-reload
 systemctl start yanic
 systemctl enable yanic
 ```
+
+### Update
+For an update just stop yanic and then call the same `go` command again (again as root):
+```sh
+systemctl stop yanic
+go get -v -u github.com/FreifunkBremen/yanic
+```
+Then update the config file, for example look at the diff with the new example:
+```sh
+diff /opt/go/src/github.com/FreifunkBremen/yanic/config_example.toml /etc/yanic.conf
+```

config_example.toml

@@ -5,8 +5,8 @@ enable           = true
 synchronize      = "1m"
 # how often request per multicast
 collect_interval = "1m"
-# on which interface
-interfaces       = ["eth0"]
+# interface that has an IP in your mesh network
+interfaces       = ["br-ffhb"]
 # define a port to listen
 # if not set or set to 0 the kernel will use a random free port at its own
 #port = 10001

runtime/config_test.go

@@ -15,7 +15,7 @@ func TestReadConfig(t *testing.T) {
 	assert.NotNil(config)
 
 	assert.True(config.Respondd.Enable)
-	assert.Equal([]string{"eth0"}, config.Respondd.Interfaces)
+	assert.Equal([]string{"br-ffhb"}, config.Respondd.Interfaces)
 	assert.Equal(time.Minute, config.Respondd.CollectInterval.Duration)
 
 	assert.Equal(time.Hour*24*7, config.Nodes.PruneAfter.Duration)