Dear fellows,
I have Centos 5.4 linux with DNS server, all logs are normal, in my /var/log/ btmp files is getting larger day by day.
What is this btmp file for?
How can i reduce the file siez or control file size.
Waiting.
MAZ (1 Reply)
Hi everyone ...
( Linux Cent OS ) i cant login as root user in my lab machine ... i did give correct root and root passwd ..but it showing Authentication Failed ...
plz help me (0 Replies)
I need to setup a proxy that will sit in front of a websockets server and proxy websockets communication both to and from the server. There will only be one specific client trying to access this server using the websockets protocol. We can configure the proxy settings for port and IP on the... (3 Replies)
Hello, when i tried to get whois on an .com domain, it automatically used tucows whois, it appears it cant connect that server, please how can i fix it, so it dont fail or use another server?
whois mydomainname.com -f
+ whoisout='
'
I have:
Linux * 2.6.18-348.3.1.el5.028stab106.2 #1... (5 Replies)
HI,
I have a Centos linux box and there is interface connect to internet.
I stop the iptables in this box .
After a few day , I find the linux box have been hacked and install some perl script into the box .
Could anyone tell me how the hacker can login into the centos box without knowing... (1 Reply)
Hi All,
I have a script that I need to schedule on daily basis. How can I schedule a script in centos. Like I want to run that script evryday at 10 AM and can I store the output of the script in a log file.
Thanks
---------- Post updated 04-18-14 at 12:52 AM ---------- Previous update... (0 Replies)
Will a program compiled in ubuntu 14.04 execute in Centos 7? That is to say a tarball or zip is downloaded from github and extracted, compiled, and make is all done in ubuntu 14.04, can I mv the program from ubuntu 14.04 to Centos 7, add it to path in Centos 7. And run it? Thank you :) (3 Replies)
Hi,
I need to know what kind of firewall settings does the linux box have? Is port 25 blocked in any way?
Linux techx 3.10.0-514.10.2.el7.x86_64 #1 SMP Fri Mar 3 00:04:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
I'm coming from this thread. (1 Reply)
Hi,
Apologies if this is not right section to post my requirement.
We have a requirement to enhance our Centos 7 Servers' security as per "CIS CentOS Linux 7 Benchmark" ( CIS WorkBench / Home ) that provides guidance for establishing a secure configuration posture for CentOS 7.
Just... (2 Replies)
Discussion started by: prvnrk
2 Replies
LEARN ABOUT SUSE
cron
CRON(8) System Manager's Manual CRON(8)NAME
cron - daemon to execute scheduled commands (ISC Cron V4.1)
SYNOPSIS
cron [-l load_avg] [-n]
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'. The -n option
changes this default behavior causing it to run in the foreground. This can be useful when starting it out of init.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
Daylight Saving Time and other time changes
Local time changes of less than three hours, such as those caused by the start or end of Daylight Saving Time, are handled specially. This
only applies to jobs that run at a specific time and jobs that are run with a granularity greater than one hour. Jobs that run more fre-
quently are scheduled normally.
If time has moved forward, those jobs that would have run in the interval that has been skipped will be run immediately. Conversely, if
time has moved backward, care is taken to avoid running jobs twice.
Time changes of more than 3 hours are considered to be corrections to the clock or timezone, and the new time is used immediately.
PAM Access Control
On SUSE LINUX systems, crond now supports access control with PAM - see pam(8). A PAM configuration file for crond is installed in
/etc/pam.d/crond . crond loads the PAM environment from the pam_env module, but these can be overriden by settings in the crontab file.
SIGNALS
On receipt of a SIGHUP, the cron daemon will close and reopen its log file. This is useful in scripts which rotate and age log files.
Naturally this is not relevant if cron was built to use syslog(3).
CAVEATS
In this version of cron, /etc/crontab must not be writable by any user other than root. No crontab files may be links, or linked to by any
other file. No crontab files may be executable, or be writable by any user other than their owner.
SEE ALSO crontab(1), crontab(5), pam(8)AUTHOR
Paul Vixie <vixie@isc.org>
4th Berkeley Distribution 10 January 1996" CRON(8)