Question : The Nautilus system admins team has prepared scripts to automate several day-to-day tasks. They want them to be deployed on all app servers in Stratos DC on a set schedule. Before that they need to test similar functionality with a sample cron job. Therefore, perform the steps below:
a. Install cronie package on all Nautilus app servers and start crond service.
b. Add a cron */5 * * * * echo hello > /tmp/cron_text for root user.
1. At first login to all App server & Switch to root user
|
thor@jump_host
~$ ssh tony@stapp01 The authenticity
of host 'stapp01 (172.16.238.10)' can't be established. ECDSA key
fingerprint is SHA256:HfSF2lgWTKxzOCOIseoaLzUMcUFiflwRYS+5VfEeADA. ECDSA key
fingerprint is MD5:90:8c:06:3d:71:b2:de:80:4d:45:e2:59:45:77:d2:7c. Are you sure you
want to continue connecting (yes/no)? yes Warning:
Permanently added 'stapp01,172.16.238.10' (ECDSA) to the list of known hosts. tony@stapp01's
password: [tony@stapp01
~]$ sudo su - We trust you have received the usual lecture from the local System Administrator.
It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great
responsibility. [sudo] password for tony: [root@stapp01
~]# |
2. Install cronie package on server
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[root@stapp01
~]# yum install cronie -y Loaded plugins:
fastestmirror, ovl Determining
fastest mirrors * base: mirror.genesisadaptive.com * extras: mirrors.gigenet.com * updates: centos.mirror.lstn.net base
| 3.6 kB 00:00:00 extras
| 2.9 kB 00:00:00 updates |
2.9 kB 00:00:00 (1/4):
base/7/x86_64/group_gz
| 153 kB 00:00:00 (2/4):
extras/7/x86_64/primary_db |
242 kB 00:00:00 (3/4):
updates/7/x86_64/primary_db
| 8.8 MB 00:00:00 (4/4):
base/7/x86_64/primary_db | 6.1 MB 00:00:00
Resolving
Dependencies --> Running
transaction check ---> Package
cronie.x86_64 0:1.4.11-23.el7 will be installed -->
Processing Dependency: dailyjobs for package: cronie-1.4.11-23.el7.x86_64 --> Running transaction
check ---> Package
cronie-anacron.x86_64 0:1.4.11-23.el7 will be installed -->
Processing Dependency: crontabs for package:
cronie-anacron-1.4.11-23.el7.x86_64 --> Running
transaction check ---> Package
crontabs.noarch 0:1.11-6.20121102git.el7 will be installed --> Finished
Dependency Resolution Dependencies Resolved ==================================================================================================================== Package Arch Version Repository Size ==================================================================================================================== Installing: cronie x86_64 1.4.11-23.el7 base 92 k Installing for
dependencies: cronie-anacron x86_64 1.4.11-23.el7 base 36 k crontabs noarch 1.11-6.20121102git.el7 base 13 k Transaction Summary ==================================================================================================================== Install 1 Package (+2 Dependent packages) Total download size: 141 k Installed size:
260 k Downloading
packages: (1/3):
cronie-anacron-1.4.11-23.el7.x86_64.rpm
| 36 kB 00:00:00
(2/3):
cronie-1.4.11-23.el7.x86_64.rpm
| 92 kB 00:00:00
(3/3):
crontabs-1.11-6.20121102git.el7.noarch.rpm
| 13 kB 00:00:00
-------------------------------------------------------------------------------------------------------------------- Total
579 kB/s | 141 kB 00:00:00 Running
transaction check Running
transaction test Transaction test
succeeded Running
transaction Installing :
cronie-anacron-1.4.11-23.el7.x86_64
1/3 Installing :
cronie-1.4.11-23.el7.x86_64
2/3 Installing :
crontabs-1.11-6.20121102git.el7.noarch
3/3 Verifying
: cronie-1.4.11-23.el7.x86_64
1/3 Verifying
: cronie-anacron-1.4.11-23.el7.x86_64
2/3 Verifying
: crontabs-1.11-6.20121102git.el7.noarch
3/3 Installed: cronie.x86_64 0:1.4.11-23.el7
Dependency Installed: cronie-anacron.x86_64 0:1.4.11-23.el7 crontabs.noarch
0:1.11-6.20121102git.el7
Complete! [root@stapp01
~]# |
3. Start cron service & check the status
|
[root@stapp01
~]# systemctl start crond.service [root@stapp01
~]# systemctl status crond.service ● crond.service
- Command Scheduler Loaded: loaded
(/usr/lib/systemd/system/crond.service; enabled; vendor preset: enabled) Active: active (running) since Wed
2021-06-23 09:48:40 UTC; 7s ago Main PID: 867 (crond) CGroup:
/docker/1e182a61c844a4126c21ead9f17af0fd695bfb11e177c1b7d3be38d07ec49c8a/system.slice/crond.service └─867 /usr/sbin/crond -n
Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com systemd[1]: About to execute: /usr/sbin/crond
-n $CRONDARGS Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com systemd[1]: Forked /usr/sbin/crond as 867 Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com crond[867]: (CRON) INFO (Syslog will be used
instead of sendmail.) Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com systemd[1]: crond.service changed dead ->
running Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com crond[867]: (CRON) INFO (RANDOM_DELAY will be
scaled with fact...d.) Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com systemd[1]: Job crond.service/start finished,
result=done Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com crond[867]: (CRON) INFO (running with inotify
support) Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com systemd[1]: Started Command Scheduler. Jun 23 09:48:40
stapp01.stratos.xfusioncorp.com systemd[867]: Executing: /usr/sbin/crond -n Hint: Some lines
were ellipsized, use -l to show in full. [root@stapp01
~]# |
|
[root@stapp01
~]# crontab -e no crontab for
root - using an empty one crontab:
installing new crontab [root@stapp01
~]# |
|
[root@stapp01
~]# crontab -l */5 * * * * echo
hello > /tmp/cron_text [root@stapp01
~]# |
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[root@stapp01
~]# ll /tmp/ total 8 -rw-r--r-- 1
root root 6 Jun 23 09:55 cron_text -rwx------ 1
root root 836 Aug 1 2019 ks-script-rnBCJB -rw------- 1
root root 0 Aug 1
2019 yum.log [root@stapp01
~]# |
Happy Learning!!!!
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