Influxd not openning ports when run as influxdb user

2

Is there a reason why you’re using 1.5.2? The latest release is 1.6.1.

Can you provide more details about how you installed InfluxDB? I wasn’t able to reproduce your issue with the latest release.

I installed CentOS 7.5.1804 in a VirtualBox VM and followed the installation instructions for Red Hat & CentOS in the documentation.

$ sudo systemctl start influxdb
$ systemctl status influxdb
● influxdb.service - InfluxDB is an open-source, distributed, time series database
   Loaded: loaded (/usr/lib/systemd/system/influxdb.service; enabled; vendor preset: disabled)
   Active: active (running) since Sun 2018-08-26 12:56:23 EDT; 1s ago
     Docs: https://docs.influxdata.com/influxdb/
 Main PID: 10952 (influxd)
   CGroup: /system.slice/influxdb.service
           └─10952 /usr/bin/influxd -config /etc/influxdb/influxdb.conf

Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.448403Z lvl=info msg="Starting precreation service" log_id=0A9nUd1W000 service=shard-...period=30m
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.448415Z lvl=info msg="Starting snapshot service" log_id=0A9nUd1W000 service=snapshot
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.448420Z lvl=info msg="Starting continuous query service" log_id=0A9nUd1W000 service=c...us_querier
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.448428Z lvl=info msg="Starting HTTP service" log_id=0A9nUd1W000 service=httpd authentication=false
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.448432Z lvl=info msg="opened HTTP access log" log_id=0A9nUd1W000 service=httpd path=stderr
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.448526Z lvl=info msg="Listening on HTTP" log_id=0A9nUd1W000 service=httpd addr=[::]:8...ttps=false
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.448538Z lvl=info msg="Starting retention policy enforcement service" log_id=0A9nUd1W0...terval=30m
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.451540Z lvl=info msg="Listening for signals" log_id=0A9nUd1W000
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.451884Z lvl=info msg="Storing statistics" log_id=0A9nUd1W000 service=monitor db_insta...terval=10s
Aug 26 12:56:23 localhost.localdomain influxd[10952]: ts=2018-08-26T16:56:23.452022Z lvl=info msg="Sending usage statistics to usage.influxdata.com" log_id=0A9nUd1W000
Hint: Some lines were ellipsized, use -l to show in full.

I verified that it was running as the influxdb user:

$ ps aux | grep influ[x]
influxdb 10952  0.2  0.8 386364 16364 ?        Ssl  12:56   0:00 /usr/bin/influxd -config /etc/influxdb/influxdb.conf

and also verified that ports were being opened:

$ ss -lntu
Netid State      Recv-Q Send-Q                                        Local Address:Port                                                       Peer Address:Port              
udp   UNCONN     0      0                                                 127.0.0.1:323                                                                   *:*                  
udp   UNCONN     0      0                                                         *:68                                                                    *:*                  
udp   UNCONN     0      0                                                       ::1:323                                                                  :::*                  
tcp   LISTEN     0      128                                                       *:22                                                                    *:*                  
tcp   LISTEN     0      128                                               127.0.0.1:8088                                                                  *:*                  
tcp   LISTEN     0      100                                               127.0.0.1:25                                                                    *:*                  
tcp   LISTEN     0      128                                                      :::8086                                                                 :::*                  
tcp   LISTEN     0      128                                                      :::22                                                                   :::*                  
tcp   LISTEN     0      100                                                     ::1:25                                                                   :::*

I was also able to connect to InfluxDB using the CLI on localhost:

$ influx
Connected to http://localhost:8086 version 1.6.1
InfluxDB shell version: 1.6.1
>

I was not, however, able to connect to InfluxDB from outside of the virtual machine:

$ influx -host 10.0.2.10 -port 8086
Failed to connect to http://10.0.2.10:8086: Get http://10.0.2.10:8086/ping: dial tcp 10.0.2.10:8086: connect: connection refused
Please check your connection settings and ensure 'influxd' is running.

This is because CentOS comes with FirewallD enabled by default. I adding the InfluxDB port to the public zone:

$ sudo firewall-cmd --zone=public --add-port=8086/tcp
success

and was able to connect from an external machine:

$ influx -host 10.0.2.10 -port 8086
Connected to http://10.0.2.10:8086 version 1.6.1
InfluxDB shell version: v1.6.1
>

Digital Ocean has a great post on FirewallD for CentOS 7 which goes into more detail on the daemon, including how to set up a FirewallD service and permanently adding it to a zone.

If you’re going to expose your InfluxDB instance to the public, you should enable authentication and HTTPS.

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