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Running Two varnishncsa Instances using Systemd : looking for best practice
yassine.aouadi90 at gmail
Jan 29, 2020, 7:07 AM
Post #1 of 4 (958 views)
Permalink
Hello ,

I Would like to Split my Varnish logs into access log and error log file
:

I Know I can reach my goal by command line using varnishncsa :

---
*usr/bin/varnishncsa -c -b -a -w /var/log/varnish/access-varnishncsa.log
-D -f /etc/varnish/varnishncsa_logmatic.format -q 'RespStatus < 400' &&
/usr/bin/varnishncsa -c -b -a -w /var/log/varnish/error-varnishncsa.log
-D -f /etc/varnish/varnishncsa_logmatic.format -q 'RespStatus > 399'*
---

I am looking now to edit my varnishncsa unit file so i can do the same
using systemd :

This is my actual unit file with one Varnishncsa instance :
*---*



















*[Unit]Description=Varnish HTTP accelerator log
daemonDocumentation=https://www.varnish-cache.org/docs/4.1/
<https://www.varnish-cache.org/docs/4.1/>
man:varnishncsaAfter=varnish.service[Service]Type=forkingPIDFile=/run/varnishncsa/varnishncsa.pidRuntimeDirectory=varnishncsaUser=varnishlogGroup=varnishExecStart=/usr/bin/varnishncsa
-c -b -a -w /var/log/varnish/access-varnishncsa.log -D -f
/etc/varnish/varnishncsa_logmatic.formatExecReload=/bin/kill -HUP
$MAINPIDPrivateDevices=truePrivateTmp=trueProtectHome=trueProtectSystem=full[Install]WantedBy=multi-user.target*

---

What is the best practice to do so ?
Can I use the same one unit file and use a one shot exec start ? Or
should I split unit files and run two different systemd varnishncsa
services (instances)?


Regards,

Yassine Aouadi
Re: Running Two varnishncsa Instances using Systemd : looking for best practice [ In reply to ]
dridi at varni
Jan 29, 2020, 8:05 AM
Post #2 of 4 (958 views)
Permalink
Hi,

On Wed, Jan 29, 2020 at 3:09 PM Yassine Aouadi
<yassine.aouadi90@gmail.com> wrote:
>
> Hello ,
>
> I Would like to Split my Varnish logs into access log and error log file :
>
> I Know I can reach my goal by command line using varnishncsa :
>
> ---
> usr/bin/varnishncsa -c -b -a -w /var/log/varnish/access-varnishncsa.log -D -f /etc/varnish/varnishncsa_logmatic.format -q 'RespStatus < 400' && /usr/bin/varnishncsa -c -b -a -w /var/log/varnish/error-varnishncsa.log -D -f /etc/varnish/varnishncsa_logmatic.format -q 'RespStatus > 399'
> ---

Since you are using both -c and -b you want both client and backend
transactions but your query will only capture client transactions, use
this instead:

-q '*Status < 400'
-q '*Status > 399'

This should work with either RespStatus or BerespStatus.

> I am looking now to edit my varnishncsa unit file so i can do the same using systemd :
>
> This is my actual unit file with one Varnishncsa instance :
> ---
> [Unit]
> Description=Varnish HTTP accelerator log daemon
> Documentation=https://www.varnish-cache.org/docs/4.1/ man:varnishncsa
> After=varnish.service
>
> [Service]
> Type=forking
> PIDFile=/run/varnishncsa/varnishncsa.pid
> RuntimeDirectory=varnishncsa
> User=varnishlog
> Group=varnish
> ExecStart=/usr/bin/varnishncsa -c -b -a -w /var/log/varnish/access-varnishncsa.log -D -f /etc/varnish/varnishncsa_logmatic.format
> ExecReload=/bin/kill -HUP $MAINPID
> PrivateDevices=true
> PrivateTmp=true
> ProtectHome=true
> ProtectSystem=full
>
> [Install]
> WantedBy=multi-user.target
>
> ---
>
> What is the best practice to do so ?
> Can I use the same one unit file and use a one shot exec start ? Or should I split unit files and run two different systemd varnishncsa services (instances)?

I think the simplest is to have multiple units.


Dridi
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Re: Running Two varnishncsa Instances using Systemd : looking for best practice [ In reply to ]
yassine.aouadi90 at gmail
Jan 29, 2020, 8:57 AM
Post #3 of 4 (958 views)
Permalink
Dridi,

Thank you for the Catch !

I was going to correct with "RespStatus > 399 or BerespStatus > 399" but
yours is better.


Splitting the unitsseems to look fine in Dev :

---
? varnishncsa-access.service - Varnish HTTP accelerator log daemon
Loaded: loaded (/lib/systemd/system/varnishncsa-access.service;
disabled; vendor preset: enabled)
Active: active (running) since Wed 2020-01-29 16:52:15 UTC; 5s ago
Docs: https://www.varnish-cache.org/docs/4.1/
man:varnishncsa
Process: 10571 ExecStart=/usr/bin/varnishncsa -c -b -a -w
/var/log/varnish/access-varnishncsa.log -D -P
/run/varnishncsa/varnishncsa-access.pid -f
/etc/varnish/varnishncsa_logmatic.format -q *Status < 400
Main PID: 10575 (varnishncsa)
Tasks: 1
Memory: 188.0K
CPU: 44ms
CGroup: /system.slice/varnishncsa-access.service
??10575 /usr/bin/varnishncsa -c -b -a -w
/var/log/varnish/access-varnishncsa.log -D -P
/run/varnishncsa/varnishncsa-access.pid -f
/etc/varnish/varnishncsa_logmatic.format -q *Status < 400

Jan 29 16:52:15 LAB-*** systemd[1]: Starting Varnish HTTP accelerator log
daemon...
Jan 29 16:52:15 LAB*** ystemd[1]: Started Varnish HTTP accelerator log
daemon.

? varnishncsa-error.service - Varnish HTTP accelerator log daemon
Loaded: loaded (/lib/systemd/system/varnishncsa-error.service; disabled;
vendor preset: enabled)
Active: active (running) since Wed 2020-01-29 16:52:15 UTC; 5s ago
Docs: https://www.varnish-cache.org/docs/4.1/
man:varnishncsa
Process: 10566 ExecStart=/usr/bin/varnishncsa -c -b -a -w
/var/log/varnish/error-varnishncsa.log -D -P
/run/varnishncsa/varnishncsa-error.pid -f
/etc/varnish/varnishncsa_logmatic.format -q *Status > 399
Main PID: 10574 (varnishncsa)
Tasks: 1
Memory: 312.0K
CPU: 46ms
CGroup: /system.slice/varnishncsa-error.service
??10574 /usr/bin/varnishncsa -c -b -a -w
/var/log/varnish/error-varnishncsa.log -D -P
/run/varnishncsa/varnishncsa-error.pid -f
/etc/varnish/varnishncsa_logmatic.format -q *Status > 399

Jan 29 16:52:15 LAB-*** systemd[1]: Starting Varnish HTTP accelerator log
daemon...
Jan 29 16:52:15 LAB-*** systemd[1]: Started Varnish HTTP accelerator log
daemon.
---


Would provide feedback once moving to prod.


>
>
>
>
>
>
>
>
Re: Running Two varnishncsa Instances using Systemd : looking for best practice [ In reply to ]
dridi at varni
Jan 30, 2020, 8:27 AM
Post #4 of 4 (953 views)
Permalink
On Wed, Jan 29, 2020 at 4:59 PM Yassine Aouadi
<yassine.aouadi90@gmail.com> wrote:
>
>
> Dridi,
>
> Thank you for the Catch !
>
> I was going to correct with "RespStatus > 399 or BerespStatus > 399" but yours is better.

Pick whatever works best for you ;-)

> Splitting the unitsseems to look fine in Dev :
>
> ---
> ? varnishncsa-access.service - Varnish HTTP accelerator log daemon
> Loaded: loaded (/lib/systemd/system/varnishncsa-access.service; disabled; vendor preset: enabled)
> Active: active (running) since Wed 2020-01-29 16:52:15 UTC; 5s ago
> Docs: https://www.varnish-cache.org/docs/4.1/
> man:varnishncsa
> Process: 10571 ExecStart=/usr/bin/varnishncsa -c -b -a -w /var/log/varnish/access-varnishncsa.log -D -P /run/varnishncsa/varnishncsa-access.pid -f /etc/varnish/varnishncsa_logmatic.format -q *Status < 400
> Main PID: 10575 (varnishncsa)
> Tasks: 1
> Memory: 188.0K
> CPU: 44ms
> CGroup: /system.slice/varnishncsa-access.service
> ??10575 /usr/bin/varnishncsa -c -b -a -w /var/log/varnish/access-varnishncsa.log -D -P /run/varnishncsa/varnishncsa-access.pid -f /etc/varnish/varnishncsa_logmatic.format -q *Status < 400
>
> Jan 29 16:52:15 LAB-*** systemd[1]: Starting Varnish HTTP accelerator log daemon...
> Jan 29 16:52:15 LAB*** ystemd[1]: Started Varnish HTTP accelerator log daemon.
>
> ? varnishncsa-error.service - Varnish HTTP accelerator log daemon
> Loaded: loaded (/lib/systemd/system/varnishncsa-error.service; disabled; vendor preset: enabled)
> Active: active (running) since Wed 2020-01-29 16:52:15 UTC; 5s ago
> Docs: https://www.varnish-cache.org/docs/4.1/
> man:varnishncsa
> Process: 10566 ExecStart=/usr/bin/varnishncsa -c -b -a -w /var/log/varnish/error-varnishncsa.log -D -P /run/varnishncsa/varnishncsa-error.pid -f /etc/varnish/varnishncsa_logmatic.format -q *Status > 399
> Main PID: 10574 (varnishncsa)
> Tasks: 1
> Memory: 312.0K
> CPU: 46ms
> CGroup: /system.slice/varnishncsa-error.service
> ??10574 /usr/bin/varnishncsa -c -b -a -w /var/log/varnish/error-varnishncsa.log -D -P /run/varnishncsa/varnishncsa-error.pid -f /etc/varnish/varnishncsa_logmatic.format -q *Status > 399
>
> Jan 29 16:52:15 LAB-*** systemd[1]: Starting Varnish HTTP accelerator log daemon...
> Jan 29 16:52:15 LAB-*** systemd[1]: Started Varnish HTTP accelerator log daemon.
> ---
>
>
> Would provide feedback once moving to prod.

Please note that you can also put the query in a file with Varnish
6.3, so in theory you could do something like this:

[Unit]
Description=Varnish HTTP accelerator log daemon
Documentation=https://www.varnish-cache.org/docs/4.1/ man:varnishncsa
After=varnish.service

[Service]
Type=forking
PIDFile=/run/varnishncsa/%i.pid
RuntimeDirectory=varnishncsa
User=varnishlog
Group=varnish
ExecStart=/usr/bin/varnishncsa -c -b -a -w
/var/log/varnish/%i-varnishncsa.log -D \
-f /etc/varnish/varnishncsa_logmatic.format -Q /etc/varnish/%i.vslq
ExecReload=/bin/kill -HUP $MAINPID
PrivateDevices=true
PrivateTmp=true
ProtectHome=true
ProtectSystem=full

[Install]
WantedBy=multi-user.target

Then you can manage both services from the same unit:

systemctl start varnishncsa@access.service varnishncsa@error.service

In /etc/varnish/access.vslq you would write:

*Status < 400

I'll leave the dirty systemd details to yourself, but that's how I'd
likely proceed :)

Dridi
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