cannot connect to web interface after reboot: nginx Connection failed

    Hi,


    I restarted my OMV5 system running on a Raspberry Pi4. I have done that before and never experienced any problems.


    After restart, I cannot connect to the web interface of OMV. I can connect to the web interface of Portainer and also the web interfaces of the containers.


    I received the following email:

    Code
    The system monitoring needs your attention.

    Host:        \omv

    Date:        Sun, 29 Mar 2020 12:54:32

    Service:     nginx

    Event:       Connection failed

    Description: failed protocol test [HTTP] at [127.0.0.1]:80 [TCP/IP] -- HTTP error: Server returned status 502

    This triggered the monitoring system to: restart

    —

    You have received this notification because you have enabled the system monitoring on this host.

    To change your notification preferences, please go to the 'System | Notification' or 'System | Monitoring' page in the web interface.


    What can I do?


    Best, Markus

    I read this post: Nginx Connection failed


    I connected with ssh to the server:


    If I understand the post correctly, shall I rename S01monit to, say S02monit?


    best, Markus

    Thank you. What does the command do?


    I also took a look at /var/log/nginx/openmediavault-webgui_error.log (see attachement).


    There are quite a few No such file or directory messages.


    Not sure what I did wrong. I simply shutdown OMV from the web interface and then started again.


    Best, Markus

    thanks.


    I ran

    Code
    sudo omv-salt stage run deploy

    and rebooted. The same picture: "502 Bad Gateway" for the web interface of OMV. The web interfaces of portainer etc. are working.


    Markus

    sorry, I had to significantly increase the number of lines in order to scrollback in Putty to spot errors.


    After...

    Code
    sudo omv-salt stage run deploy

    ... there are the following lines in red:

    Code
    ----------

    ID: run_state_deploy

    Function: salt.state

    Result: False

    Comment: Run failed on minions: raspberrypi

    Started: 14:26:55.561058

    Duration: 77387.282 ms

    Changes:

    raspberrypi:

    then there are many lines in green an then...

    and finally :



    Best, Markus

    I think it the problem is the php7.3 process:

    Code
    pi@omv:~ $ sudo systemctl restart php7.3-fpm

    Job for php7.3-fpm.service failed because the control process exited with error code.

    See "systemctl status php7.3-fpm.service" and "journalctl -xe" for details.


    Code
    pi@omv:~ $ systemctl status php7.3-fpm.service

    ● php7.3-fpm.service - The PHP 7.3 FastCGI Process Manager

    Loaded: loaded (/lib/systemd/system/php7.3-fpm.service; enabled; vendor preset: enabled)

    Active: failed (Result: exit-code) since Sun 2020-03-29 14:44:02 CEST; 503ms ago

    Docs: man:php-fpm7.3(8)

    Process: 18477 ExecStart=/usr/sbin/php-fpm7.3 --nodaemonize --fpm-config /etc/php/7.3/fpm/php-fpm.conf (code=exited, status=78)

    Main PID: 18477 (code=exited, status=78)



    Is there anything I can do?


    Best, Markus

    I tried

    Code
    sudo omv-salt deploy run phpfpm

    sudo omv-salt deploy run nginx


    nginx executed without any failures. Please find below the output for phpfm. The entire output is "green" until...

    Code
    ID: restart_phpfpm_service


    I don't understand what's going on. Here the entire output:

    Thanks. I've done the following:

    Code
    pi@omv:/var/lib/php/sessions $ sudo cp -rf /var/lib/php/sessions /var/lib/php/sessions.old

    pi@omv:/var/lib/php/sessions $ sudo rm -rf /var/lib/php/sessions

    pi@omv:/var/lib/php/sessions $ sudo mkdir -m 777 /var/lib/php/sessions

    pi@omv:/var/lib/php/sessions $ ls /var/lib/php -l

    total 12

    drwxr-xr-x 3 root root 4096 Feb 27 20:12 modules

    drwxrwxrwx 2 root root 4096 Mar 29 16:15 sessions

    drwx--x--t 2 root root 4096 Mar 29 16:15 sessions.old

    pi@omv:/var/lib/php/sessions $ sudo nginx -s reload

    pi@omv:/var/lib/php/sessions $

    I did not reboot.


    Same picture.


    I'm seeing...

    Code
    /run/php/php7.3-fpm-openmediavault-webgui.sock': No such file or directory (2)

    ... in openmediavault-webgui_error.log but also here:

    Is this a hint?


    Best, Markus

    I'm reading through this trouble shouting guide: NGINX 502 Bad Gateway: PHP-FPM


    As described earlier, I took a look at nginx' error log, as suggested in the guide:

    Quote from salgem

    I also took a look at /var/log/nginx/openmediavault-webgui_error.log (see attachement).

    I see a similar error message as in the guide int he section "NGINX can’t access the socket".


    The example is:

    Code
    connect() to unix:/run/php/mypool.sock failed (2: No such file or directory)

    on my system it is:

    Code
    2020/03/29 12:03:32 [crit] 877#877: *1 connect() to unix:/run/php/php7.3-fpm-openmediavault-webgui.sock failed (2: No such file or directory) while connecting to upstream, client: ::ffff:192.168.1.25, server: openmediavault-webgui, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.3-fpm-openmediavault-webgui.sock:", host: "192.168.1.37"


    I checked the version of php-fm (on my system, php7.3-fpm is enabled):

    Code
    pi@omv:~ $ sudo systemctl list-unit-files | grep -E 'php[^fpm]*fpm'

    php7.3-fpm.service                                   enabled

    and checked whether it is active or not (it is failed):

    Code
    pi@omv:~ $ sudo systemctl is-active php7.3-fpm.service

    failed


    Since php7.3-fpm is enabled on my system, I checked the relevant config file of the socket:

    Code
    nano /etc/php/7.3/fpm/pool.d/openmediavault-webgui.conf


    The listen socket in the config is /run/php/php7.3-fpm-openmediavault-webgui.sock:


    The guide then states: "Check your nginx.conf file to ensure that the relevant location block specifies the same socket."


    I checked the nginx.conf...

    Code
    nano /etc/nginx/nginx.conf

    .... but cannot see the relevant location "/run/php/php7.3-fpm-openmediavault-webgui.sock" anywhere in the config file of nginx:


    The example in the guide looks like this ("/run/php/mypool.sock" is the location of the socket in the example):

    Code
    location / {    include snippets/fastcgi-php.conf;

    fastcgi_pass unix:/run/php/mypool.sock;

    }


    On my install, I can see "snippets/fastcgi-php.conf" but is not mentioned anywhere in the config.


    Is the solution to add location to nginx' config file?


    Best, Markus

    This looks like the solution to my problem. One of the the files in the sites-enabled directory is...

    Code
    sudo nano /etc/nginx/sites-enabled/openmediavault-webgui

    and in the file the location to the socket is defined:



    Can you share your complete config with me?


    Thanks, M

    damn... I just checked. I did not post the complete config. The complete file looks like this:

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