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In this blog column we’re activity to awning systemd, activity avenue codes and highlight how systemd reacts in assertive avenue altitude from SQL Server on Linux. My acquaintance and SQL Server authority Argenis Fernandez – @dbargenis asked about this behavior on Twitter and I’ve been acceptation to address this post, so actuality you go! Also, there’s a Connect account filed by Argenis on this here. Vote!
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Systemd is an initialization daemon, it’s job is to accompany the arrangement to accessible state. Meaning, it’s amenable for the alike starting of casework on a Linux system. It does abundant added than that, in fact, one of it’s added amount apparatus is journald. Journald food logging advice from systemd units.
Now with account to SQL Server on Linux, the advice logged into journald is systemd’s advice about our mssql.service assemblage and additionally the SQL Server Error Log. The SQL Server Error Log acreage in actuality because it’s accounting to accepted out and by default, a account unit’s accepted out is accounting into the journal.
We can concern the advice stored in journald with the command journalctl and beneath is the syntax to concern a accurate account unit’s log in journald. Running aloof journalctl will account the argument achievement to run off the ancillary of the awning after wrapping the argument in your terminal. To get the argument to wrap, use the afterward code…then aqueduct the achievement into a pager like added or beneath because you know…less is more. We’ll use this command in the abutting section.
journalctl -u mssql-server –no-pager | more
Service units in systemd are configured in assemblage files and SQL Server on Linux’s assemblage book lives in the file /usr/lib/systemd/system/mssql-server.service. Inside that book we accept the afterward configuration:
# Restart on non-successful exits.
Restart=on-failure
What Restart=on-failure advantage does, is if a systemd assemblage allotment an barn avenue code, systemd will automatically restart the service. There are added altitude that account it to restart such as responding to barn signals, babysitter and additionally account timeouts. We’ll save those discussions for addition day.
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When a activity exits, it will acknowledgment an accumulation amount to the ancestor process. If a activity terminates cleanly, it commonly allotment 0 to the ancestor process. This agency all is able-bodied in the apple and the activity has shut down. In a relational database arrangement this is significant, in that, we absolutely do appetite our systems to shut bottomward cleanly. Now aback things go wrong, that’s aback activity acknowledgment a non-zero value. systemd is the ancestor activity of the sqlservr process and receives it’s avenue code. Let’s see what happens in assertive avenue altitude from SQL Server on Linux.
Let’s say we admit a abeyance in SQL Server the T-SQL command SHUTDOWN here’s what we’ll get in journald.
Oct 28 05:27:58 sqlb.lab.centinosystems.com sqlservr[1103]: 2017-10-28 05:27:58.37 spid51 Server shut bottomward by appeal from login sa.
Oct 28 05:27:58 sqlb.lab.centinosystems.com sqlservr[1103]: 2017-10-28 05:27:58.37 spid51 SQL Trace was chock-full due to server shutdown. Trace ID = ‘1’. This is an advisory bulletin only; no user activity is required.
Oct 28 05:28:00 sqlb.lab.centinosystems.com systemd[1]: mssql-server.service: capital activity exited, code=exited, status=1/FAILURE
Oct 28 05:28:00 sqlb.lab.centinosystems.com systemd[1]: Assemblage mssql-server.service entered bootless state.
Oct 28 05:28:00 sqlb.lab.centinosystems.com systemd[1]: mssql-server.service failed.
Oct 28 05:28:00 sqlb.lab.centinosystems.com systemd[1]: mssql-server.service holdoff time over, scheduling restart.
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Oct 28 05:28:00 sqlb.lab.centinosystems.com systemd[1]: Started Microsoft SQL Server Database Engine.
Oct 28 05:28:00 sqlb.lab.centinosystems.com systemd[1]: Starting Microsoft SQL Server Database Engine…
Oct 28 05:28:02 sqlb.lab.centinosystems.com sqlservr[1822]: 2017-10-28 05:28:02.87 Server Microsoft SQL Server 2017 (RTM-CU1) (KB4038634) – 14.0.3006.16 (X64)
Now in the achievement above, you’ll apprehension a bolded line. In there, you can arrangement that systemd[1] receives a acknowledgment cipher from SQL Server of status=1/FAILURE. Systemd[1] is the ancestor activity to sqlservr, in actuality it’s the ancestor to all processes on our system. It receives the avenue cipher and immediately, systemd initiates a restart of the account due to the agreement we accept for our mysql-server systemd unit.
What’s absorbing is that this happens alike on a accustomed shutdown. But that artlessly doesn’t accomplish sense, acknowledgment ethics on apple-pie exits should acknowledgment 0. It’s my compassionate of the SHUTDOWN command, that it will account the database agent to abeyance cleanly.
Now let’s say we admit a SHUTDOWN WITH NOWAIT
Oct 28 05:31:24 sqlb.lab.centinosystems.com sqlservr[1822]: 2017-10-28 05:31:24.22 spid51 Server shut bottomward by NOWAIT appeal from login sa.
Oct 28 05:31:24 sqlb.lab.centinosystems.com sqlservr[1822]: 2017-10-28 05:31:24.22 spid51 SQL Trace was chock-full due to server shutdown. Trace ID = ‘1’. This is an advisory bulletin only; no user activity is required.
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Oct 28 05:31:25 sqlb.lab.centinosystems.com systemd[1]: mssql-server.service: capital activity exited, code=exited, status=1/FAILURE
Oct 28 05:31:25 sqlb.lab.centinosystems.com systemd[1]: Assemblage mssql-server.service entered bootless state.
Oct 28 05:31:25 sqlb.lab.centinosystems.com systemd[1]: mssql-server.service failed.
Oct 28 05:31:25 sqlb.lab.centinosystems.com systemd[1]: mssql-server.service holdoff time over, scheduling restart.
Oct 28 05:31:25 sqlb.lab.centinosystems.com systemd[1]: Started Microsoft SQL Server Database Engine.
Oct 28 05:31:25 sqlb.lab.centinosystems.com systemd[1]: Starting Microsoft SQL Server Database Engine…
Oct 28 05:31:27 sqlb.lab.centinosystems.com sqlservr[2035]: 2017-10-28 05:31:27.64 Server Microsoft SQL Server 2017 (RTM-CU1) (KB4038634) – 14.0.3006.16 (X64)
In this output, we see the aforementioned behavior, SQL Server allotment a status=1/FAILURE and restarts. This makes faculty to me, an actual abeyance should acknowledgment a non-zero amount and it does.
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In this column we covered, systemd units and their restart configurations. We looked at avenue codes and how they’re acclimated to acquaint aback to the ancestor activity about the child’s avenue status. While it’s aloof SQL Server…as DBAs we still charge to apprentice about this new operating ambiance and how it works! Keep learning!
The column Avenue Codes, systemd and SQL Server on Linux appeared aboriginal on Centino Systems Blog.
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