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What does kill HUP do?
The kill command sends a signal to specified processes or process groups, causing them to act according to the signal. The most commonly used signals are: 1 ( HUP ) – Reload a process.
What does Hup mean in Linux?
no hang up
nohup is a POSIX command which means “no hang up”. Its purpose is to execute a command such that it ignores the HUP (hangup) signal and therefore does not stop when the user logs out. Output that would normally go to the terminal goes to a file called nohup. out, if it has not already been redirected.
What is logrotate used for?
logrotate is designed to ease administration of systems that generate large numbers of log files. It allows automatic rotation, compression, removal, and mailing of log files. Each log file may be handled daily, weekly, monthly, or when it grows too large. Normally, logrotate is run as a daily cron job.
What is Maxage in logrotate?
When using the mail command, mail the about-to-expire file, instead of the just-rotated file (this is the default). maxage count. Remove rotated logs older than days. The age is only checked if the logfile is to be rotated. The files are mailed to the configured address if maillast and mail are configured.
Does Sighup kill a process?
kill command does not kill the process when it sends SIGTERM or SIGHUP signal to the process because the signal is blocked in parent and the same mask is shared by the child process.
Why do I need to use-Hup in syslog?
I understood that -HUP is used because daemons like syslog, when they catch the SIGHUP, will try to restart itself and thus all the openfiles will be refreshed. I do not understand why they need to be refreshed. If syslog does only appending new log to the log files, the open files would be in write mode.
Why does Red Hat logrotate not rotate well?
I want to rotate all the logs coming from network devices. First day logs are arriving and storaging well, but when it arrives the daily logrotate, logs are still storaging in the old file (the rotated one), leting empty the new one. See the example: Do you know what is causing this issue?
Which is RSYSLOG or logroatate.d in RHEL 7?
My RHEL 7 systems use ‘rsyslogd’, but the logroatate.d entry is still called ‘syslog’ (not rsyslog) – and the pid file /var/run/syslog is for the ‘rsyslog’ process. Based on your ‘ls’ output, it looks like the (r)syslog process is not getting the ‘kill -HUP’ signal from the ‘postrotate’ section of the logrotate config.
Why do I send a HUP signal to Crond?
Sending the HUP signal to crond will force him to close existing file handle and open new file handle to the original path /var/log/cron.log which will create a new file. The use of the HUP signal instead of another one is at the discretion of the program.