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Ubuntu 16.04 LTS 在 /lib/systemd/system/[email protected] 中更改 OOMScoreAdjust 无效

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Ubuntu 16.04 LTS 在 /lib/systemd/system/[email protected] 中更改 OOMScoreAdjust 无效

正如标题所示，我有我的[电子邮件保护]操作如下：

 # systemd service template for PostgreSQL clusters. The actual instances will
# be called "postgresql@version-cluster", e.g. "[email protected]". The
# variable %i expands to "version-cluster", %I expands to "version/cluster".
# (%I breaks for cluster names containing dashes.)

[Unit]
Description=PostgreSQL Cluster %i
ConditionPathExists=/etc/postgresql/%I/postgresql.conf
PartOf=postgresql.service
ReloadPropagatedFrom=postgresql.service
Before=postgresql.service

[Service]
Type=forking
# @: use "postgresql@%i" as process name
ExecStart=@/usr/bin/pg_ctlcluster postgresql@%i --skip-systemctl-redirect %i start
ExecStop=/usr/bin/pg_ctlcluster --skip-systemctl-redirect -m fast %i stop
ExecReload=/usr/bin/pg_ctlcluster --skip-systemctl-redirect %i reload
PIDFile=/var/run/postgresql/%i.pid
SyslogIdentifier=postgresql@%i
# prevent OOM killer from choosing the postmaster (individual backends will
# reset the score to 0)
OOMScoreAdjust=-999
# restarting automatically will prevent "pg_ctlcluster ... stop" from working,
# so we disable it here. Also, the postmaster will restart by itself on most
# problems anyway, so it is questionable if one wants to enable external
# automatic restarts.
#Restart=on-failure
# (This should make pg_ctlcluster stop work, but doesn't:)
#RestartPreventExitStatus=SIGINT SIGTERM

[Install]
WantedBy=multi-user.target

然后我检查 /proc/pid/oom_score_adj，它仍然显示默认值 -900。我想知道出了什么问题？

答案1

由starts-up定义的服务。我们在里面找到以下内容：/lib/systemd/system/[email protected]/usr/bin/pg_ctlclusterpg_ctlcluster

if ($action eq 'start' and $version >= '9.0' and not $PgCommon::rpm) {
    if (-w '/proc/self/oom_score_adj') {
        open F, '>/proc/self/oom_score_adj';
        print F "-900\n";
        close F;
    } 
}

看起来 Postgres 自己的脚本在启动时设置了该值。我对其进行了编辑-999，它完成了工作。

答案2

您必须在进行更改后重新加载服务，或者为确保更改生效，请停止服务然后重新启动它。

# maybe
systemctl reload [email protected]

# definitely
systemctl stop [email protected]
systemctl start [email protected]

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