Docker Container Woes

Help
1

Hi all -

Having a real headache getting the official LibreNMS Docker container to work with the example config - I’m running Centos7 on ESXi and have disabled selinux for now.

I followed the Docker Compose instructions here to the letter:

https://github.com/librenms/docker/blob/master/doc/usage.md

I left all of the example file contents as they were, hoping that everything would at least start up (without the correct hostname etc), but I can’t get the web UI to load.

docker-compose logs | grep error doesn’t show any errors - here are the last few lines (guessing the SMTP_PASSWORD messages are not fatal to the app as a whole):

db_1         | 2020-04-28 19:05:35 140533594838784 [Note] InnoDB: Buffer pool(s) load completed at 200428 19:05:35
librenms     | Nothing to migrate.
librenms     | [cont-init.d] 04-svc-main.sh: exited 0.
librenms     | [cont-init.d] 05-svc-cron.sh: executing...
librenms     | [cont-init.d] 05-svc-cron.sh: exited 0.
librenms     | [cont-init.d] 06-svc-syslogng.sh: executing...
librenms     | [cont-init.d] 06-svc-syslogng.sh: exited 0.
librenms     | [cont-init.d] done.
librenms     | [services.d] starting services
librenms     | 2020/04/28 19:05:35 [notice] 318#318: using the "epoll" event method
librenms     | 2020/04/28 19:05:35 [notice] 318#318: nginx/1.16.1
librenms     | 2020/04/28 19:05:35 [notice] 318#318: OS: Linux 3.10.0-1127.el7.x86_64
librenms     | 2020/04/28 19:05:35 [notice] 318#318: getrlimit(RLIMIT_NOFILE): 1048576:1048576
librenms     | 2020/04/28 19:05:35 [notice] 318#318: start worker processes
librenms     | 2020/04/28 19:05:35 [notice] 318#318: start worker process 325
librenms     | [services.d] done.
librenms     | [28-Apr-2020 19:05:35] NOTICE: fpm is running, pid 316
librenms     | [28-Apr-2020 19:05:35] NOTICE: ready to handle connections
librenms_smtp exited with code 1
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
librenms_smtp exited with code 1
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
cron_1       | crond: USER librenms pid 320 cmd /opt/librenms/alerts.php >> /dev/null 2>&1
librenms_smtp exited with code 1
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
smtp_1       | SMTP_PASSWORD is not set
librenms     | OMITTED - - [28/Apr/2020:19:06:46 +0200] "GET / HTTP/1.1" 302 386 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0"
librenms     | OMITTED - - [28/Apr/2020:19:06:46 +0200] "GET /login HTTP/1.1" 200 2401 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0"

Port 8000 is listening (assuming that’s what I should connect to to see the LibreNMS GUI?):

netstat -plant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1619/master
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1068/sshd
tcp        0     36 OMITTED:22       OMITTED:25688      ESTABLISHED 12010/sshd: root@pt
tcp6       0      0 ::1:25                  :::*                    LISTEN      1619/master
tcp6       0      0 :::8000                 :::*                    LISTEN      20091/docker-proxy
tcp6       0      0 :::514                  :::*                    LISTEN      20570/docker-proxy
tcp6       0      0 :::22                   :::*                    LISTEN      1068/sshd

Navigating to http://OMITTED:8000 redirects to OMITTED/login and the page doesn’t load (presumably because nothing is listening on TCP 80). I am seeing some 200 HTTP response codes in the log (see above).

Running containers:

docker ps
CONTAINER ID        IMAGE                      COMMAND                  CREATED             STATUS                         PORTS                                                  NAMES
382f1508f001        librenms/librenms:latest   "/init"                  16 minutes ago      Up 3 minutes                   514/tcp, 8000/tcp, 514/udp                             librenms_cron
a7c183cb5203        librenms/librenms:latest   "/init"                  16 minutes ago      Up 3 minutes                   0.0.0.0:514->514/tcp, 0.0.0.0:514->514/udp, 8000/tcp   librenms_syslog
b2d71f2126f2        librenms/librenms:latest   "/init"                  16 minutes ago      Up 3 minutes                   514/tcp, 514/udp, 0.0.0.0:8000->8000/tcp               librenms
a173db1e5aca        crazymax/rrdcached         "/entrypoint.sh /usr…"   16 minutes ago      Up 3 minutes (healthy)         42217/tcp                                              librenms_rrdcached
9f171c76a1e8        juanluisbaptiste/postfix   "/run.sh"                16 minutes ago      Restarting (1) 7 seconds ago                                                          librenms_smtp
811239db7d04        mariadb:10.2               "docker-entrypoint.s…"   16 minutes ago      Up 3 minutes                   3306/tcp                                               librenms_db
14458bfdc2e4        memcached:alpine           "docker-entrypoint.s…"   16 minutes ago      Up 3 minutes                   11211/tcp                                              librenms_memcached

Docker version: 19.03.8, build afacb8b

Have I missed anything obvious? I tried messing around with the traefik example and got a little further (it would display 404 errors, which showed the web server was running) but again, couldn’t get the UI to load.

Any help would be gratefully received.

2

Just to update what I have done since the post above:

1: Tried installing LibreNMS natively with Nginx - this resulted in a PHP issue which I tried to troubleshoot with members on Discord (thanks to those who assisted). We changed a lot of settings, but could not get the web pages to load after Setup was completed.
2: Decided to reinstall CentOS 7 and start from scratch with the Docker container again (as that is how I want to run it).
3: Used the Docker-Compose example again and this time, added a hostname to .env and docker-compose.yml - I’m not using DNS here, so I added the same hostname for the machine to my Windows hosts file and also the /etc/hosts file on the CentOS machine.

I’m still running into the same problem - the web server itself seems to be working OK (http://omitted:8000 redirects to /login) but then the login page does not load - I can’t proceed any further.

Guessing it’s a PHP issue, or an issue with NGINX talking to PHP (same as I saw with the native install)… can anyone suggest how to troubleshoot this further?

3

Did you user the docker-compose.yml or the minimal run command in that how-to link?

If docker-compose please attach that file.

I’m no expert but I’ve spun up a couple of instances using compose