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Pass commands as input to another command (su, ssh, sh, etc)
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Closed 6 years ago.
This is the script but output is wrong even Apache is running its show stop. I'm using Ubuntu 12.04.
ssh -qn root# ip
if ps aux | grep [h]ttpd > /dev/null
then
echo "Apcache is running"
else
echo "Apcahe is not running"
fi
Try the following:
if ssh -qn root#ip pidof httpd &>/dev/null ; then
echo "Apache is running";
exit 0;
else
echo "Apache is not running";
exit 1;
fi
These exit commands will send the correct EXIT_SUCCESS and EXIT_FAILURE too ( Will be usefull to extend this script in future, if you need ).
But ONE ADVICE : Is better to put the script as a remote process to run with a sudoer user over ssh account
You are not running the commands on the remote host.
Try this instead.
if ssh -qn root#ip ps aux | grep -q httpd; then
echo "Apache is running"
else
echo "Apache is not running"
fi
Just to be explicit, ps aux is the argument to ssh and so that is what is being executed on the remote host. The grep runs as a child of the local script.
First of all httpd is not available in ubuntu. For ubuntu apache2 is available.
So this command ps aux | grep [h]ttpd will not work on ubuntu.
No need to write any script to check the apache status. From ubuntu terminal run this command to get the status:
sudo service apache2 status
Output will be:
A > if apache is running: Apache2 is running (pid 1234)
B > if apache is not running: Apache2 is NOT running.
Since ssh returns with exit status of the remote command check man page for ssh and search for exit status
so Its as simple as
ssh root#ip "/etc/init.d/apache2 status"
if [ $? -ne 0 ]; then # if service is running exit status is 0 for "/etc/init.d/apache2 status"
echo "Apache is not running"
else
echo "Apache is running"
fi
You do not need ps or grep for this
Related
So i am running this script to check if a java server is up remotely by sshing into remote. If it is down, i am trying to exit and run another script locally. However, after the exit command, it is still in the remote directory.
ssh -i ec2-user#$DNS << EOF
if ! lsof -i | grep -q java ; then
echo "java server stopped running"
# want to exit ssh
exit
# after here when i check it is still in ssh
# I want to run another script locally in the same directory as the current script
./other_script.sh
else
echo "java server up"
fi;
EOF
The exit is exiting the ssh session and so never gets to the execution of the other_script.sh line in the HEREDOC. It would be better to place this outside of the script and actioned from the exit status of the HEREDOC/ssh and so:
ssh -i ec2-user#$DNS << EOF
if ! lsof -i | grep -q java ; then
echo "java server stopped running"
exit 7 # Set the exit status to a number that isn't standard in case ssh fails
else
echo "java server up"
fi;
EOF
if [[ $? -eq 7 ]]
then
./other_script.sh
fi
I want to check if one, (or all) services are running, if yes, stop it
#!/bin/bash
# Define an array of processes to be checked.
# If properly quoted, these may contain spaces
check_process=( "nagios" "httpd" )
for p in "${check_process[#]}"; do
if pgrep "$p" > /dev/null; then
echo "Process \`$p' is running, stopping it"
service $p stop
else
echo "Process \`$p' is not running"
fi
done
For httpd service all works fine, script detects correctly httpd service state.
I have issues detecting nagios service state.
But although nagios service is not running, script shows it's running
Process `nagios' is running, stopping it
Stopping nagios:No lock file found in /usr/local/nagios/var/nagios.lock
Process `httpd' is not running
Is there any more elegant way of detecting if nagios service is running without checking if nagios.lock file exists ?
pgrep nagios shows no output when service is not tunning.
I gave up, this works fine for me:
although ps -ef | grep -v grep | grep $service | wc -l shows 0 for nagios, script reports that nagios service is running
#!/bin/bash
logfile=/tmp/stop_nagios.txt
exec >> $logfile
exec 2>&1
service=httpd
if (( $(ps -ef | grep -v grep | grep $service | wc -l) > 0 ))
then
echo "$service is running, stopping it"
date
sudo service $service stop
else
echo "$service is not running"
fi
# check nagios service
FILE=/usr/local/nagios/var/nagios.lock
if test -f "$FILE"; then
echo "nagios service is running, stopping it"
date
sudo service nagios stop
else
echo "nagios is not running..."
fi
I have to check service is running or not on Remote Server(192.168.1.105) using Nagios Server if service is not running then I want to run this service.
I am using Nagios with NRPE.
For this I am using below script
#!/bin/bash
if pgrep -f "index.js" >/dev/null; then
echo "index.js is Running."
exit 0
else
echo "index.js is Stopped."
exit 2
fi
With help of above script i am able to check service is running or not.
But my question is that if service is not running so how can i run this service.
For run service on remote server i am just edit the above service as mentioned in below
#!/bin/bash
if pgrep -f "index.js" >/dev/null; then
echo "index.js is Running."
exit 0
else
echo "index.js is Stopped."
servicestatus=$(ssh root#192.168.1.105 nohup node /root/demo/index.js > index.log &)
echo "$servicestatus"
exit 2
fi
But this is not working for me.
I am new to bash scripting and trying to figure out why the below script is outputting that Apache server is not running whereas it is running properly.
ps cax | grep httpd
if [ $? -eq 0 ]; then
echo "Process is running."
else
echo "Process is not running."
fi
I'm running it on Ubuntu 14.04.2 LTS
Also, how do I make changes to the script that this can test apache server installed on another machine.
Kindly help
This is a working sample of bash script which check the apache status, restart it automatically if down, and alert by telegram bot within unicode emoji.
#!/bin/bash
telegram=(xxxxx, yyyyyy)
if ! pidof apache2 > /dev/null
then
# web server down, restart the server
echo "Server down"
/etc/init.d/apache2 restart > /dev/null
sleep 10
#checking if apache restarted or not
if pidof apache2 > /dev/null
then
for i in "${telegram[#]}"
do
curl -s -X POST https://api.telegram.org/botxxxxxx:yyyyyyyyyyyyyyyyyyyyyyyyyy/sendMessage -d chat_id="$i" -d text="`echo -e '\U0001F525'` Apache stoped on Molib Stage. Automatically restarted succesfully."
done
else
for i in "${telegram[#]}"
do
curl -s -X POST https://api.telegram.org/botxxxxxx:yyyyyyyyyyyyyyyyyyyyyyyyyy/sendMessage -d chat_id="$i" -d text="`echo -e '\U0001F525'` Apache stoped on Molib Stage. Automatically restart failed. Please check manually."
done
fi
fi
Use this:
service apache2 status
Or this:
service --status-all | grep apache2
Instead of httpd try to grep "apache2". To be sure try to check services with the next command and decide the registered name of the apache webserver:
service --status-all
Try and see - simply simplest, most didactic here and well working on Ubuntu 20.04:
catching output of status to bash variable
"if" status includes substring (from "Active:" statement) - do job you wanted
"else" - do another job you defined
#!/bin/bash
servstat=$(service apache2 status)
if [[ $servstat == *"active (running)"* ]]; then
echo "process is running"
else echo "process is not running"
fi
This work perfect in an old Debian. Remember to run with bash and not with sh.
In Centos replace with httpd.
#!/bin/bash
if [ $(/etc/init.d/apache2 status | grep -v grep | grep 'apache2 is running' | wc -l) > 0 ]
then
echo "Process is running."
else
echo "Process is not running."
fi
## Plz run this script .. its working
------------------------------------------------
ps cax | grep httpd
if [ $? -eq 1 ]
then
echo "Process is running."
else if [ $? -eq 0 ]
echo "Process is not running."
fi
fi
----------------------------------------------
This is menu driven one stop shell script in which you can check the firewall,apache or any other webservices ,you can start or stop the services just by choosing the option in below script
echo "welcome please select your options"
read choice
firewall=`sudo systemctl status firewalld`
apache=`sudo systemctl status apache2`
firewall1=`sudo systemctl stop firewalld`
apache1=`sudo systemctl stop apache2`
startrfirewall=`sudo systemctl start firewalld`
startapache=`sudo systemctl start apache2`
case $choice in
1) status of the firewall is $firewall
;;
2) status of apache is $apache
;;
3) echo stop firewall by $firewall1
;;
4) echo stop apache by $apache1
;;
5) echo start firewall by $startrfirewall
;;
6) echo start apache by $startapache
;;
*) echo exit
esac
I put this together based on the above and made so can use other services.
Hope this helps.
#!/bin/bash
# Must be running as root or via sudo permissions to be able to restart
# Put your process name restart command line in
PROCESS_NAME=httpd
if ! pidof $PROCESS_NAME > /dev/null
then
# web server down, restart the server
echo "Server $PROCESS_NAME down"
/usr/sbin/apachectl restart > /dev/null
echo "Tried restart of $PROCESS_NAME. Waiting 10 seconds to settle."
# wait ten
sleep 10
#checking if process restarted or not
if pidof $PROCESS_NAME > /dev/null
then
echo "$PROCESS_NAME was down but is now up."
else
echo "$PROCESS_NAME is still down. Please take some action."
fi
else
echo "Server $PROCESS_NAME up."
fi
Hi what is the best way to check to see if SSH fails for whatever reason?
Can I use a IF statement ( if it fails then do something)
I'm using the ssh command in a loop and passing my hosts names form a flat file.
so I do something like:
for i in `cat /tmp/hosts` ; do ssh $i 'hostname;sudo ethtool eth1'; done
I get sometime this error or I just cannot connect
ssh: host1 Temporary failure in name resolution
I want to skip the hosts that I cannot connect to is SSH fails. What is the best way to do this? Is there a runtime error I can trap to bypass the hosts that I cannot ssh into for whatever reason, perhaps ssh is not allowed or I do not have the right password ?
Thanking you in advance
Cheers
To check if there was a problem connecting and/or running the remote command:
if ! ssh host command
then
echo "SSH connection or remote command failed"
fi
To check if there was a problem connecting, regardless of success of the remote command (unless it happens to return status 255, which is rare):
if ssh host command; [ $? -eq 255 ]
then
echo "SSH connection failed"
fi
Applied to your example, this would be:
for i in `cat /tmp/hosts` ;
do
if ! ssh $i 'hostname;sudo ethtool eth1';
then
echo "Connection or remote command on $i failed";
fi
done
You can check the return value that ssh gives you as originally shown here:
How to create a bash script to check the SSH connection?
$ ssh -q user#downhost exit
$ echo $?
255
$ ssh -q user#uphost exit
$ echo $?
0
EDIT - I cheated and used nc
Something like this:
#!/bin/bash
ssh_port_is_open() { nc -z ${1:?hostname} 22 > /dev/null; }
for host in `cat /tmp/hosts` ; do
if ssh_port_is_open $host; then
ssh -o "BatchMode=yes" $i 'hostname; sudo ethtool eth1';
else
echo " $i Down"
fi
done