crontab执行结果未通过mail通知用户
source link: https://www.lujun9972.win/blog/2019/06/22/crontab%E6%89%A7%E8%A1%8C%E7%BB%93%E6%9E%9C%E6%9C%AA%E9%80%9A%E8%BF%87mail%E9%80%9A%E7%9F%A5%E7%94%A8%E6%88%B7/index.html
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crontab执行结果未通过mail通知用户
在某台 centos7 主机上设置了某个 crontab 任务，但是到时间后运行 mail 后提示 No mail,即cron没有将任务的执行结果发送邮件通知到用户
检查
crontab日志centos的日志由
systemd进行管理的，因此可以通过systemctl来查看相关日志。journalctl _COMM=crond --since=today
或者用root查看日志
/var/log/cronsudo cat /var/log/cron |grep -v '/usr/local/qcloud/stargate/admin/start.sh'
最终我们在日志中会看到一行提示
Jun 22 00:50:19 localhost CROND[21181]: (lujun9972) MAIL (mailed 102 bytes of output but got status 0x004b#012)也就是邮件发送时失败了。
检查
mail日志查看
/var/log/maillog日志会发现日志中提示Jun 22 00:50:19 localhost postfix/sendmail[21403]: fatal: parameter inet_interfaces: no local interface found for ::1也就是说
mail提示无法为主机上 IPV6 的地址::1发现对应的网卡
注释掉 /etc/hosts 中 ::1 对应的地址后发现mail的错误信息变成了 postfix/postdrop[5487]: warning: unable to look up public/pickup: No such file or directory
经过搜索，只需要自己创建缺失文件再重启 postfix 服务即可。
sudo mkfifo /var/spool/postfix/public/pickup sudo chown postfix:postdrop pickup systemctl restart postfix.service
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