# Graylog Not connecting to mongodb **URL:** \ **Category:** Graylog Central (peer support)\ **Created:** [February 17, 2025, 11:59am UTC](https://community.graylog.org/t/graylog-not-connecting-to-mongodb/34953 "2025-02-17T11:59:33Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Smiles](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/smiles/32/17644_2.png) [@Smiles](https://community.graylog.org/u/Smiles)\ **Post date:** [February 17, 2025, 11:59am UTC](https://community.graylog.org/t/graylog-not-connecting-to-mongodb/34953/1 "2025-02-17T11:59:33Z")
Before you post: Your responses to these questions will help the community help you. Please complete this template if you’re asking a support question. **Don’t forget to select tags to help index your topic!** **1. Describe your incident:** I am new to Graylog. I have installed Graylog as per the steps at [Red Hat Installation](https://go2docs.graylog.org/current/downloading_and_installing_graylog/red_hat_installation.htm). However, it seems like it is not working as expected with mongo db in Replica set. So, basically, what I am trying to achieve is redundancy. Such that if one server fails, we have a backup server. Main: 172.29.164.165 Backup: 10.184.162.145 However, it seems like Graylog is not connecting with the mongodb server. When I start Graylog, I get the following continuous error message: svdt1graylog ~]$ **tail -f /var/log/graylog-server/server.log** 2025-02-17T14:23:33.956+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46510 2025-02-17T14:23:35.956+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46511 2025-02-17T14:23:37.957+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46512 2025-02-17T14:23:39.957+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46513 2025-02-17T14:23:41.958+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46514 2025-02-17T14:23:43.958+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46515 2025-02-17T14:23:45.959+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46516 2025-02-17T14:23:47.959+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46517 2025-02-17T14:23:49.959+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46518 2025-02-17T14:23:51.960+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46519 2025-02-17T14:23:53.960+03:00 INFO [MongoDBPreflightCheck] MongoDB is not available. Retry #46520 Therefore, Graylog is not binding to port 9000. Here is my setup: server configurations ```auto is_leader = true node_id_file = /etc/graylog/server/node-id password_secret = *********************** root_username = admin root_password_sha2 = *************** root_timezone = Africa/Nairobi bin_dir = /usr/share/graylog-server/bin data_dir = /var/lib/graylog-server plugin_dir = /usr/share/graylog-server/plugin http_bind_address = 172.29.164.16:9000 #http_bind_address = [2001:db8::1]:9000 allow_leading_wildcard_searches = false allow_highlighting = false field_value_suggestion_mode = on output_batch_size = 500 output_flush_interval = 1 output_fault_count_threshold = 5 output_fault_penalty_seconds = 30 processor_wait_strategy = blocking ring_size = 65536 inputbuffer_ring_size = 65536 inputbuffer_wait_strategy = blocking message_journal_enabled = true message_journal_dir = /var/lib/graylog-server/journal lb_recognition_period_seconds = 3 mongodb_uri = mongodb://172.29.164.165,10.184.162.145/graylog?replicaSet=graylogs_mongodb mongodb_max_connections = 1000 integrations_scripts_dir = /usr/share/graylog-server/scripts ``` ```auto sudo systemctl status mongod ``` MongoDb configurations are okay and the primary and secondary sets are working well with Despite everything being up the port is still not binding to Graylog therefore, the server is not listening to the port sudo firewall-cmd --list-ports | grep 9000 ```auto 8080/tcp 9000/tcp 9010/tcp 9200/tcp 27017/tcp ``` sudo semanage port -a -t http\_port\_t -p tcp 9000 ```auto Port tcp/9000 already defined, modifying instead ``` **2. Describe your environment:** - OS Information: Redhat 9.5 - Package Version:Graylog 6 **3. What steps have you already taken to try and solve the problem?** I have enabled the port with firewalld Restarted my VM server Reinstalled Graylog and Graylog data node **4. How can the community help?** How can I get Graylog to connect with Replicaset Mongodb setup. **Helpful Posting Tips:** [Tips for Posting Questions that Get Answers](https://community.graylog.org/t/tips-for-posting-questions-that-get-answers/21828) [Hold down CTRL and link on link to open tips documents in a separate tab] ---
**Author:** ![Joel\_Duffield](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@Joel\_Duffield](https://community.graylog.org/u/Joel_Duffield)\ **Post date:** [February 17, 2025, 1:32pm UTC](https://community.graylog.org/t/graylog-not-connecting-to-mongodb/34953/2 "2025-02-17T13:32:43Z")
Can you connect to both mongodb servers from each server with mongosh (the mongo client) as in connect to both locsl and remote. ---
**Author:** ![Smiles](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/smiles/32/17644_2.png) [@Smiles](https://community.graylog.org/u/Smiles)\ **Post date:** [February 18, 2025, 2:39pm UTC](https://community.graylog.org/t/graylog-not-connecting-to-mongodb/34953/3 "2025-02-18T14:39:51Z")
Yes, they can connect. I realized that the issue was with the credentials. when creating a replica set, you will have to create authentication credentials as described here [https://go2docs.graylog.org/current/setting\_up\_graylog/multi-node\_setup.html](https://go2docs.graylog.org/current/setting_up_graylog/multi-node_setup.html). I created those and included them on my mongodb\_uri and it connected to Mongodb. Thank you very much for the help. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/3X/c/7/c7c09c6b5099570133d6502b83f50ba4430de5b6.png) [@system](https://community.graylog.org/u/system)\ **Post date:** [March 4, 2025, 2:39pm UTC](https://community.graylog.org/t/graylog-not-connecting-to-mongodb/34953/4 "2025-03-04T14:39:58Z")
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