Hello StackOverflow Gods/Regulars/Users !
I am currently working on a logging system for two applications running on my servers.
Here is the context :
[Unit] Description="Algo EP" [Service] Type=simple User=me WorkingDirectory=/home/me/bin ExecStart=/home/me/bin/AlgoEp StandardOutput=syslog StandardError=syslog SyslogIdentifier=dev1_algo_ep [Install] WantedBy=multi-user.target
[Unit] Description="Algo MDW" [Service] Type=simple User=me WorkingDirectory=/home/me/bin ExecStart=/home/me/bin/AlgoMdw StandardOutput=syslog StandardError=syslog SyslogIdentifier=dev1_algo_mdw [Install] WantedBy=multi-user.target
[Unit] Description="Algo EP" [Service] Type=simple User=me WorkingDirectory=/home/me/bin ExecStart=/home/me/bin/AlgoEp StandardOutput=syslog StandardError=syslog SyslogIdentifier=dev2_algo_ep [Install] WantedBy=multi-user.target
I wanted to be able to read the log of each service when I ssh on dev1 using journalctl (systemd-journal).
Like this:journalctl -t dev1_algo_ep -t dev1_algo_mdw -t dev2_algo_ep
So, I added a rsyslog.d/algo-ep.conf
on dev2:
if $programname == 'dev2_algo_ep' then {
action(type="omfwd"
queue.type="linkedlist"
queue.filename="algo_fwd"
queue.saveOnShutdown="on"
action.resumeRetryCount="-1"
target="dev1" port="514" protocol="tcp"
)
}
and added rsyslog.d/algo.conf
on dev1:
module(load="imtcp")
module(load="omjournal")
ruleset(name="remote-dev2") {
action(type="omjournal")
}
input(type="imtcp" port="514" ruleset="remote-dev2")
At this point, no problem, I got the line in journalctl with journalctl -r
:
Nov 23 13:27:47 dev1 dev2_algo_ep[3142]:[15246]: Ep Server listening on localhost:10001...
Nov 23 13:27:47 dev1 dev2_algo_ep[2421]:[15246]: Ep Server stops...
[...]
But when I try journalctl -t dev2_algo_ep
:
me@dev1:~$ journalctl -t dev2_algo_ep
-- Logs begin at Fri 2018-06-01 13:54:11 CEST, end at Fri 2018-11-23 13:27:47 CET. --
me@dev1:~$
Because received log's SYSLOG_IDENTIFIER is set as dev2_algo_ep[3142]:
instead of dev2_algo_ep
.
So, my question : Is there a way, magical or obvious
Thanks in advance for your advice, your help and your information !
[Edit] It seems that the mix rsyslog + journald is very little known. I didn't found anything in the man page (except the possibility to create a template to rebuild the log at reception on dev1, but looks pretty odd to me).
option1
since you already got log from journalctl, you can use json format to check what field the line you want, e.g. check what value in SYSLOG_IDENTIFIER
field.
the following line shows SYSLOG_IDENTIFIER
is nginx
, so you can use journalctl -t nginx
journalctl -o json
{ "__CURSOR" : "s=00000000000000000000000000000000;i=146c8;b=170127f0cd5441a3bea76fe326915bd0;m=bb5bba879;t=590367fad5ace;x=33cdab5cd2077705", "__REALTIME_TIMESTAMP" : "1565938628254414", "__MONOTONIC_TIMESTAMP" : "50293614713", "_BOOT_ID" : "170127f0cd5441a3bea76fe326915bd0", "_SELINUX_CONTEXT" : "unconfined\n", "_SYSTEMD_SLICE" : "system.slice", "_MACHINE_ID" : "4211ff3f594041f3966d836585a11a05", "_HOSTNAME" : "VM-0-4-ubuntu", "_TRANSPORT" : "journal", "_CAP_EFFECTIVE" : "0", "PRIORITY" : "5", "_UID" : "102", "_GID" : "106", "_COMM" : "rsyslogd", "_EXE" : "/usr/sbin/rsyslogd", "_CMDLINE" : "/usr/sbin/rsyslogd -n", "_SYSTEMD_CGROUP" : "/system.slice/rsyslog.service", "_SYSTEMD_UNIT" : "rsyslog.service", "_PID" : "3280", "_SYSTEMD_INVOCATION_ID" : "270801fdff7943bc83cd7cef242b3271", "CODE_FILE" : "omjournal.c", "CODE_LINE" : "270", "CODE_FUNC" : "send_non_template_message", "SYSLOG_FACILITY" : "16", "SYSLOG_IDENTIFIER" : "nginx", "MESSAGE" : "36.24.73.111 - - [16/Aug/2019:14:57:08 +0800] \"GET /favicon.ico HTTP/1.1\" 200 946 \"http://111.231.88.233/todo\" \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36\"", "_SOURCE_REALTIME_TIMESTAMP" : "1565938628254404" }
option2
if you cannot find the SYSLOG_IDENTIFIER
, check the rsyslog input module doc. imfile
has the tag
parameter, so you can use journalctl -t nginx
to get the log.
check following example
module(load="imfile")
module(load="omjournal")
ruleset(name="nginx") {
action(type="omjournal")
}
input(
type="imfile"
File="/var/log/nginx/access.log"
tag="nginx"
ruleset="nginx")
option3
you need check omjournal
doc, omjournal
has a parameter called tempalte
, which you can specify the format you sent to journald
check following docs.
hope it helps.