Merge pull request #6 from UlfBj/master

Tutorial datastore update

tutorial/content/datastore/memcached/_index.md

@@ -0,0 +1,25 @@
+---
+title: "VISSR Memcached"
+---
+
+## Memcached state storage
+Quoting from the [Memcached](https://memcached.org/) site, "Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects)".
+The key is in this context the path, and the value is a JSON string containing the value and the associated time stamp.
+
+The memcached store is started as a daemon, which is not automatically terminated when the server terminates.
+The commands below can be used to manually terminate the memcached daemon.
+
+$ ps -A | grep "memcached"
+
+then remove it with the command
+
+$ kill pid
+
+where pid comes from the result of the first command.
+
+Communication with the Memcached daemon is for security reasons configured to use Unix domain sockets. This requires that the socket file, and the directory it is stored in exist.
+If not then create it with the commands
+
+$ makedir path-to-socket-file-directory
+
+$ touch socket-file-name

tutorial/content/datastore/redis/_index.md

@@ -8,7 +8,7 @@ Instead it is necessary to configure and launch the daemon.
 This is already configured in the redis/redisNative.conf that is used as input in the bash command in the server/viss2server/redisNativeInit.sh file that is called at server startup.
 
 To avoid multiple daemons being started, the server checks if the daemon is already running before starting an instance of it.
-If there is a need to stop a running daemon, first find the daemon pid with the command
+If there is a need to terminate a running daemon, first find the daemon pid with the command
 
 $ ps -A | grep "redis"