Hello,
We're currently implementing a setup with three-graylog servers, and we're
having a lot of problems getting MongoDb to work correctly with Graylog:
- In order to run a cluster of three Graylog (1.2.1) servers, you need
to set up a MongoDB replica set.
- 'mongodb_uri' (set in the configuration file) needs to point to the
MongoDB replica set *primary*; (in this case we try to set it to "vm-0").
- Graylog fails with the following error if the URI does not point to
the replica set primary (at least on initial startup):
ERROR [CmdLineTool] Guice error (more detail on log level debug): Error
injecting constructor, com.mongodb.CommandFailureException: { "serverUsed" :
"vm-0:27017" , "ok" : 0.0 , "errmsg" : "not master" , "code" : 10107}
- There is no way to specify three mongodb_uri values, and let Graylog
'detect' which of these is primary.
- It is difficult to force MongoDB to set a particular VM to be primary
reliably.
This means that it is difficult to guarantee that mongodb_uri is pointing
to the current MongoDB master. There's only two ways I know how to ensure
Graylog' mongo_uri is pointing to the current master:
- Dynamically change the Graylog configuration file to point to the
current primary each time Graylog starts up.
- Write scripts to try force MongoDB's to place its primary on a
particular server.
Neither of these are very good solutions, and manual setup is not an option
(the deployment is fully automated).
Is there an easier way of configuring Graylog to always point towards the
current MongoDB replica set primary? Unfortunately, my options don't
include upgrading to 2.0.
Thanks for any help you can offer; if any clarification is needed please
leave an email and I'll respond quickly.
*Server Layout:*
VM-0:
- Graylog-Server
- ElasticSearch
- MongoDb
VM-1:
- Graylog-Server
- Graylog-Web
- ElasticSearch
- MongoDb
VM-2:
- Graylog-Server
- ElasticSearch
- MongoDb
*Versions:*
- Web 1.3.3
- Server 1.2.2
*Graylog's MongoDb-Related Configuration:*
mongodb_useauth = false
mongodb_uri = mongodb:
//vm-0:27017/graylog2
mongodb_max_connections = 100
mongodb_threads_allowed_to_block_multiplier = 5
mongodb_replica_set = vm-0:27017,vm-1:27017,
vm-2:27017
*MongoDB Configuration:*
storage:
dbPath: /var/lib/mongodb
journal:
enabled: true
systemLog:
destination: file
logAppend: true
path: /var/log/mongodb/mongod.log
net:
port: 27017
replication:
replSetName: vm-replicaset-0
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