Re: Latest stable Ubuntu 16.04 ntopng deb fails on supposed missing redis server but only when started by systemctl

Hi Kevin,

Can you successfully use the redis cli tools? For example, can you 
successfully run "redis-cli info" from the terminal?

Regards,

Emanuele

On 2/21/19 3:50 AM, Kevin Branch wrote:
> This issue has come up with newer version(s) of the ntopng deb.  
> Specifically I was just now testing with this deb:
>
>     http://packages.ntop.org/apt-stable/16.04/x64/ntopng_3.8.190219-6179_amd64.deb
>
> and using this /etc/ntopng/ntopng.conf
>
>
>     --http-port=0
>     --https-port=3000
>     --data-dir=/usr/local/ntopng
>     --local-networks="192.168.0.0/16,10.0.0.0/8,172.16.0.0/12
>     <http://192.168.0.0/16,10.0.0.0/8,172.16.0.0/12>"
>     --interface=eth1
>     --interface=eth2
>     --dns-mode=1
>     --community
>     --daemon
>     --disable-login=1
>     -G=/var/tmp/ntopng.pid
>
> If I try to start it with "systemctl start ntopng", it fails with this 
> complaint even through stock Ubuntu redis-server is indeed running:
>
>
>     Feb 20 19:29:35 nsm.server.org
>     <http://nsm.server.org/> ntopng[7443]: 20/Feb/2019 19:29:35
>     [Redis.cpp:111] ERROR: ntopng requires redis server to be up and
>     running
>     Feb 20 19:29:35 nsm.server .org ntopng[7443]: 20/Feb/2019 19:29:35
>     [Redis.cpp:112] ERROR: Please start it and try again or use -r
>     Feb 20 19:29:35 nsm.server .org ntopng[7443]: 20/Feb/2019 19:29:35
>     [Redis.cpp:113] ERROR: to specify a redis server other than the
>     default
>
>
> Manually adding the -r option to ntopng.conf pointed at the running 
> redis-server listener makes no difference.
>
> But if I start it ntopng the manual way, it starts up, daemonizes, and 
> works just fine in my web browser:
>
>     /usr/local/bin/ntopng /etc/ntopng/ntopng.conf
>
> In either case, my redis-server is installed and running just fine
>
>     root@nsm:~# apt info redis-server
>     E: Invalid operation info
>     root@nsm:~# apt show redis-server
>     Package: redis-server
>     Version: 2:3.0.6-1ubuntu0.3
>     Priority: optional
>     Section: universe/misc
>     Source: redis
>     Origin: Ubuntu
>     ...
>
>     root@nsm:~# systemctl status redis-server
>     ● redis-server.service - Advanced key-value store
>        Loaded: loaded (/lib/systemd/system/redis-server.service;
>     enabled; vendor preset: enabled)
>        Active: active (running) since Wed 2019-02-20 18:31:08 UTC;
>     56min ago
>        ...
>
>
> Somehow it appears that the running redis-server process is invisible 
> to systemd where ntopng is involved, thus preventing my from using 
> systemctl to start it.
>
> Do you have any idea what might be going on?
> Kevin Branch
>
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