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Check if PHP script is running, and if not run it

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1

I am running a PHP file using

nohup php server.php &

This listens for a particular port and does actions according to the input.

The problem is that sometimes the script stops. I cannot use a cron job to fix this, because my server is listening to a port all the time and also is creating child processes.

Is there a way to check if server.php is running and (if not) start it?

php background-process

share|improve this question

edited Oct 26 '15 at 1:05

jasonwryan

53.5k1414 gold badges141141 silver badges195195 bronze badges

asked Jun 30 '15 at 12:23

user1842264user1842264

1311 silver badge33 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Make server.php listen on an UNIX domain socket, and answer with its status when queried. Poll it from cron every few minutes, and restart it if it doesn't answer.
  
  – lcd047
  Jun 30 '15 at 13:41
  
  
  

  
  
  
  

add a comment
 | 

1

I am running a PHP file using

nohup php server.php &

This listens for a particular port and does actions according to the input.

The problem is that sometimes the script stops. I cannot use a cron job to fix this, because my server is listening to a port all the time and also is creating child processes.

Is there a way to check if server.php is running and (if not) start it?

php background-process

share|improve this question

edited Oct 26 '15 at 1:05

jasonwryan

53.5k1414 gold badges141141 silver badges195195 bronze badges

asked Jun 30 '15 at 12:23

user1842264user1842264

1311 silver badge33 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Make server.php listen on an UNIX domain socket, and answer with its status when queried. Poll it from cron every few minutes, and restart it if it doesn't answer.
  
  – lcd047
  Jun 30 '15 at 13:41
  
  
  

  
  
  
  

add a comment
 | 

I am running a PHP file using

nohup php server.php &

This listens for a particular port and does actions according to the input.

The problem is that sometimes the script stops. I cannot use a cron job to fix this, because my server is listening to a port all the time and also is creating child processes.

Is there a way to check if server.php is running and (if not) start it?

php background-process

share|improve this question

edited Oct 26 '15 at 1:05

jasonwryan

53.5k1414 gold badges141141 silver badges195195 bronze badges

asked Jun 30 '15 at 12:23

user1842264user1842264

1311 silver badge33 bronze badges

nohup php server.php &

share|improve this question

edited Oct 26 '15 at 1:05

jasonwryan

53.5k1414 gold badges141141 silver badges195195 bronze badges

asked Jun 30 '15 at 12:23

user1842264user1842264

1311 silver badge33 bronze badges

share|improve this question

edited Oct 26 '15 at 1:05

jasonwryan

53.5k1414 gold badges141141 silver badges195195 bronze badges

asked Jun 30 '15 at 12:23

user1842264user1842264

1311 silver badge33 bronze badges

edited Oct 26 '15 at 1:05

jasonwryan

53.5k1414 gold badges141141 silver badges195195 bronze badges

edited Oct 26 '15 at 1:05

jasonwryan

53.5k1414 gold badges141141 silver badges195195 bronze badges

asked Jun 30 '15 at 12:23

user1842264user1842264

1311 silver badge33 bronze badges

asked Jun 30 '15 at 12:23

user1842264user1842264

1311 silver badge33 bronze badges

3 Answers
3

active

oldest

votes

1

You can check for the process using ps, but one drawback is that if you have multiple instances of this process running or if the script is hung up then this method can be less than conclusive.

I prefer to actually check if the server is listening on the port. Here are a couple of ways to do this. If your server is listening on port 2000 for example consider the following.

Using lsof

lsof -i :2000; echo $?;

lsof is checking for open file descriptors and should show whether or not a program is listening or actively communicating on this port. This will echo either a 0 if the server is accepting connections on port 2000 or a 1 if it is not.

Using nc

nc -z -w1 192.168.1.12 2000 &> /dev/null; echo $?;

This is my preferred method for checking on a socket server. Here nc is using the -z flag for zero I/O mode to quickly scan the port. You can use your IP address here and the correct port. If the server is accepting connections then life is good.

Again here return values will be either a 0 for good or a 1 for not good. We are discarding any output here because we are wanting just a quick boolean check. This method returns very fast if the network address is reachable. Run from the server itself you will not see hardly any latency as it is trying to talk to itself.

Automating

To run these tests via cron, create a bash script and execute one or both of these commands and run through a series of logical checks. If they fail restart your script and recheck. I have been using these methods for several years now and have had very good results of practical uptime.

share|improve this answer

answered Jun 30 '15 at 13:08

111---111---

3,0071414 silver badges4141 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i am trying to automate the same but when i use nohup inside the bash its running and exiting at the same time ( executing the bash from root folder )
  
  – user1842264
  Jul 1 '15 at 10:31
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please check this link unix.stackexchange.com/questions/213283/…
  
  – user1842264
  Jul 1 '15 at 10:39
  
  
  

  
  
  
  

add a comment
 | 

0

Little bit late to the party...

By using the restartd daemon you are able to run programs and bash scripts. Restartd will check every 20 seconds (configurable) if the programs in its list are running.

See the man page here

share|improve this answer

answered Jan 14 '17 at 22:03

markmark

10133 bronze badges

add a comment
 | 

0

not sure this solve your XY problem

if ps -C php -o args h | grep -q server.php

then true ## php server.php running

else php server.php ## not running

fi

ps

• 
  -C php will seach for php instance,


• 
  -o args will display full command line,


• 
  h without header

grep

• 
  -q be quiet

---

This will check whether php server.php is running, if programm is stop process will be here and will no relaunch.

Real solution include polling server.php using whatever connection, expecting a know answer without timeout. if fail relaunch.

share|improve this answer

edited Mar 17 '18 at 23:39

Rui F Ribeiro

41.8k1616 gold badges9797 silver badges158158 bronze badges

answered Jun 30 '15 at 12:52

ArchemarArchemar

21.7k99 gold badges4242 silver badges7777 bronze badges

add a comment
 | 

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1

You can check for the process using ps, but one drawback is that if you have multiple instances of this process running or if the script is hung up then this method can be less than conclusive.

I prefer to actually check if the server is listening on the port. Here are a couple of ways to do this. If your server is listening on port 2000 for example consider the following.

Using lsof

lsof -i :2000; echo $?;

lsof is checking for open file descriptors and should show whether or not a program is listening or actively communicating on this port. This will echo either a 0 if the server is accepting connections on port 2000 or a 1 if it is not.

Using nc

nc -z -w1 192.168.1.12 2000 &> /dev/null; echo $?;

This is my preferred method for checking on a socket server. Here nc is using the -z flag for zero I/O mode to quickly scan the port. You can use your IP address here and the correct port. If the server is accepting connections then life is good.

Again here return values will be either a 0 for good or a 1 for not good. We are discarding any output here because we are wanting just a quick boolean check. This method returns very fast if the network address is reachable. Run from the server itself you will not see hardly any latency as it is trying to talk to itself.

Automating

To run these tests via cron, create a bash script and execute one or both of these commands and run through a series of logical checks. If they fail restart your script and recheck. I have been using these methods for several years now and have had very good results of practical uptime.

share|improve this answer

answered Jun 30 '15 at 13:08

111---111---

3,0071414 silver badges4141 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i am trying to automate the same but when i use nohup inside the bash its running and exiting at the same time ( executing the bash from root folder )
  
  – user1842264
  Jul 1 '15 at 10:31
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please check this link unix.stackexchange.com/questions/213283/…
  
  – user1842264
  Jul 1 '15 at 10:39
  
  
  

  
  
  
  

add a comment
 | 

1

You can check for the process using ps, but one drawback is that if you have multiple instances of this process running or if the script is hung up then this method can be less than conclusive.

I prefer to actually check if the server is listening on the port. Here are a couple of ways to do this. If your server is listening on port 2000 for example consider the following.

Using lsof

lsof -i :2000; echo $?;

lsof is checking for open file descriptors and should show whether or not a program is listening or actively communicating on this port. This will echo either a 0 if the server is accepting connections on port 2000 or a 1 if it is not.

Using nc

nc -z -w1 192.168.1.12 2000 &> /dev/null; echo $?;

This is my preferred method for checking on a socket server. Here nc is using the -z flag for zero I/O mode to quickly scan the port. You can use your IP address here and the correct port. If the server is accepting connections then life is good.

Again here return values will be either a 0 for good or a 1 for not good. We are discarding any output here because we are wanting just a quick boolean check. This method returns very fast if the network address is reachable. Run from the server itself you will not see hardly any latency as it is trying to talk to itself.

Automating

To run these tests via cron, create a bash script and execute one or both of these commands and run through a series of logical checks. If they fail restart your script and recheck. I have been using these methods for several years now and have had very good results of practical uptime.

share|improve this answer

answered Jun 30 '15 at 13:08

111---111---

3,0071414 silver badges4141 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i am trying to automate the same but when i use nohup inside the bash its running and exiting at the same time ( executing the bash from root folder )
  
  – user1842264
  Jul 1 '15 at 10:31
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Please check this link unix.stackexchange.com/questions/213283/…
  
  – user1842264
  Jul 1 '15 at 10:39
  
  
  

  
  
  
  

add a comment
 | 

You can check for the process using ps, but one drawback is that if you have multiple instances of this process running or if the script is hung up then this method can be less than conclusive.

I prefer to actually check if the server is listening on the port. Here are a couple of ways to do this. If your server is listening on port 2000 for example consider the following.

Using lsof

lsof -i :2000; echo $?;

lsof is checking for open file descriptors and should show whether or not a program is listening or actively communicating on this port. This will echo either a 0 if the server is accepting connections on port 2000 or a 1 if it is not.

Using nc

nc -z -w1 192.168.1.12 2000 &> /dev/null; echo $?;

This is my preferred method for checking on a socket server. Here nc is using the -z flag for zero I/O mode to quickly scan the port. You can use your IP address here and the correct port. If the server is accepting connections then life is good.

Again here return values will be either a 0 for good or a 1 for not good. We are discarding any output here because we are wanting just a quick boolean check. This method returns very fast if the network address is reachable. Run from the server itself you will not see hardly any latency as it is trying to talk to itself.

Automating

To run these tests via cron, create a bash script and execute one or both of these commands and run through a series of logical checks. If they fail restart your script and recheck. I have been using these methods for several years now and have had very good results of practical uptime.

share|improve this answer

answered Jun 30 '15 at 13:08

111---111---

3,0071414 silver badges4141 bronze badges

lsof -i :2000; echo $?;

nc -z -w1 192.168.1.12 2000 &> /dev/null; echo $?;

share|improve this answer

answered Jun 30 '15 at 13:08

111---111---

3,0071414 silver badges4141 bronze badges

answered Jun 30 '15 at 13:08

111---111---

3,0071414 silver badges4141 bronze badges

answered Jun 30 '15 at 13:08

111---111---

3,0071414 silver badges4141 bronze badges

0

Little bit late to the party...

By using the restartd daemon you are able to run programs and bash scripts. Restartd will check every 20 seconds (configurable) if the programs in its list are running.

See the man page here

share|improve this answer

answered Jan 14 '17 at 22:03

markmark

10133 bronze badges

add a comment
 | 

0

Little bit late to the party...

By using the restartd daemon you are able to run programs and bash scripts. Restartd will check every 20 seconds (configurable) if the programs in its list are running.

See the man page here

share|improve this answer

answered Jan 14 '17 at 22:03

markmark

10133 bronze badges

add a comment
 | 

Little bit late to the party...

By using the restartd daemon you are able to run programs and bash scripts. Restartd will check every 20 seconds (configurable) if the programs in its list are running.

See the man page here

share|improve this answer

answered Jan 14 '17 at 22:03

markmark

10133 bronze badges

share|improve this answer

answered Jan 14 '17 at 22:03

markmark

10133 bronze badges

answered Jan 14 '17 at 22:03

markmark

10133 bronze badges

answered Jan 14 '17 at 22:03

markmark

10133 bronze badges

0

not sure this solve your XY problem

if ps -C php -o args h | grep -q server.php

then true ## php server.php running

else php server.php ## not running

fi

ps

• 
  -C php will seach for php instance,


• 
  -o args will display full command line,


• 
  h without header

grep

• 
  -q be quiet

---

This will check whether php server.php is running, if programm is stop process will be here and will no relaunch.

Real solution include polling server.php using whatever connection, expecting a know answer without timeout. if fail relaunch.

share|improve this answer

edited Mar 17 '18 at 23:39

Rui F Ribeiro

41.8k1616 gold badges9797 silver badges158158 bronze badges

answered Jun 30 '15 at 12:52

ArchemarArchemar

21.7k99 gold badges4242 silver badges7777 bronze badges

add a comment
 | 

0

not sure this solve your XY problem

if ps -C php -o args h | grep -q server.php

then true ## php server.php running

else php server.php ## not running

fi

ps

• 
  -C php will seach for php instance,


• 
  -o args will display full command line,


• 
  h without header

grep

• 
  -q be quiet

---

This will check whether php server.php is running, if programm is stop process will be here and will no relaunch.

Real solution include polling server.php using whatever connection, expecting a know answer without timeout. if fail relaunch.

share|improve this answer

edited Mar 17 '18 at 23:39

Rui F Ribeiro

41.8k1616 gold badges9797 silver badges158158 bronze badges

answered Jun 30 '15 at 12:52

ArchemarArchemar

21.7k99 gold badges4242 silver badges7777 bronze badges

add a comment
 | 

not sure this solve your XY problem

if ps -C php -o args h | grep -q server.php

then true ## php server.php running

else php server.php ## not running

fi

ps

• 
  -C php will seach for php instance,


• 
  -o args will display full command line,


• 
  h without header

grep

• 
  -q be quiet

---

This will check whether php server.php is running, if programm is stop process will be here and will no relaunch.

Real solution include polling server.php using whatever connection, expecting a know answer without timeout. if fail relaunch.

share|improve this answer

edited Mar 17 '18 at 23:39

Rui F Ribeiro

41.8k1616 gold badges9797 silver badges158158 bronze badges

answered Jun 30 '15 at 12:52

ArchemarArchemar

21.7k99 gold badges4242 silver badges7777 bronze badges

if ps -C php -o args h | grep -q server.php

then true ## php server.php running

else php server.php ## not running

fi

share|improve this answer

edited Mar 17 '18 at 23:39

Rui F Ribeiro

41.8k1616 gold badges9797 silver badges158158 bronze badges

answered Jun 30 '15 at 12:52

ArchemarArchemar

21.7k99 gold badges4242 silver badges7777 bronze badges

edited Mar 17 '18 at 23:39

Rui F Ribeiro

41.8k1616 gold badges9797 silver badges158158 bronze badges

edited Mar 17 '18 at 23:39

Rui F Ribeiro

41.8k1616 gold badges9797 silver badges158158 bronze badges

answered Jun 30 '15 at 12:52

ArchemarArchemar

21.7k99 gold badges4242 silver badges7777 bronze badges

answered Jun 30 '15 at 12:52

ArchemarArchemar

21.7k99 gold badges4242 silver badges7777 bronze badges