Plugin:exec-redis.sh

Redis is a high-perf NoSQL data structure server with persistent storage.

Code

Create /etc/collectd/redis.sh and make it executable:

 #!/bin/bash
 
 HOSTNAME=`hostname -f`
 PORT=6379
 INTERVAL=10
 
 while true; do
 
 info=$(echo info|nc -w 1 127.0.0.1 $PORT)
 connected_clients=$(echo "$info"|awk -F : '$1 == "connected_clients" {print $2}')
 connected_slaves=$(echo "$info"|awk -F : '$1 == "connected_slaves" {print $2}')
 uptime=$(echo "$info"|awk -F : '$1 == "uptime_in_seconds" {print $2}')
 used_memory=$(echo "$info"|awk -F ":" '$1 == "used_memory" {print $2}'|sed -e 's/\r//')
 changes_since_last_save=$(echo "$info"|awk -F : '$1 == "changes_since_last_save" {print $2}')
 total_commands_processed=$(echo "$info"|awk -F : '$1 == "total_commands_processed" {print $2}')
 keys=$(echo "$info"|egrep -e "^db0"|sed -e 's/^.\+:keys=//'|sed -e 's/,.\+//')
 
 echo "PUTVAL $HOSTNAME/redis-$PORT/memcached_connections-clients interval=$INTERVAL N:$connected_clients"
 echo "PUTVAL $HOSTNAME/redis-$PORT/memcached_connections-slaves interval=$INTERVAL N:$connected_slaves"
 echo "PUTVAL $HOSTNAME/redis-$PORT/uptime interval=$INTERVAL N:$uptime"
 echo "PUTVAL $HOSTNAME/redis-$PORT/df-memory interval=$INTERVAL N:$used_memory:U"
 echo "PUTVAL $HOSTNAME/redis-$PORT/files-unsaved_changes interval=$INTERVAL N:$changes_since_last_save"
 echo "PUTVAL $HOSTNAME/redis-$PORT/memcached_command-total interval=$INTERVAL N:$total_commands_processed"
 echo "PUTVAL $HOSTNAME/redis-$PORT/memcached_items-db0 interval=$INTERVAL N:$keys"
 
 sleep $INTERVAL
 done

Configure the exec plugin:

<Plugin exec>
	Exec nobody "/etc/collectd/redis.sh"
</Plugin>

Example graph