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Change the resource limits (ulimit / rlimit) of a running process

ulimit: difference between hard and soft limitsWhat are the dangers of setting a high limit to max File Descriptors per process?Limits on the number of file descriptorsProcess specific ulimit still low after changes to soft and hard ulimitsWhat are pending signals?Can I set a resource limit for the current process tree?Configuring ulimit of `max open files` for daemonized nginx master processulimit value not changing for a processHow can a process have a higher open file descriptors limit than that set by the hard limit?ulimit - one service affects another

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0

I have a long-running process that is hitting a resource limit, such as the maximum number of open files.

I don't want to kill it.

Usually, you'd do:

(stop service)

ulimit -n <new limit>

(start service)

Is there a way to avoid having to stop and start the service and increase the limits?

linux ulimit

share|improve this question

edited yesterday

Bart

asked yesterday

BartBart

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add a comment | 

0

I have a long-running process that is hitting a resource limit, such as the maximum number of open files.

I don't want to kill it.

Usually, you'd do:

(stop service)

ulimit -n <new limit>

(start service)

Is there a way to avoid having to stop and start the service and increase the limits?

linux ulimit

share|improve this question

edited yesterday

Bart

asked yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

add a comment | 

I have a long-running process that is hitting a resource limit, such as the maximum number of open files.

I don't want to kill it.

Usually, you'd do:

(stop service)

ulimit -n <new limit>

(start service)

Is there a way to avoid having to stop and start the service and increase the limits?

linux ulimit

share|improve this question

edited yesterday

Bart

asked yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

(stop service)

ulimit -n <new limit>

(start service)

share|improve this question

edited yesterday

Bart

asked yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

share|improve this question

edited yesterday

Bart

asked yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

asked yesterday

BartBart

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asked yesterday

BartBart

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1 Answer
1

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oldest

votes

1

I've figured it out.

On some kernels (e.g. 2.6.32+), at least on CentOS/RHEL, you can change the resource limits of a running process using /proc/<pid>/limits, e.g.:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            1024                 4096                 files     

To change the maximum open files to a soft limit of 4096, hard limit of 8192:

echo -n "Max open files=4096:8192" > /proc/23052/limits

This gives:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files

Note the -n in echo -n - without that, you'll get an "invalid argument" error.

The above doesn't always work, so

Another option is prlimit command, introduced with util-linux 2.21 allows you to read and change the limits of running processes.

This is a followup to the writable /proc/<pid>/limits, which was not integrated in mainline kernel. This solution should work.

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052

RESOURCE SOFT HARD

NOFILE   1024 4096

Set the limits:

$ prlimit --nofile=4096:8192 --pid 23052

Confirm:

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052RESOURCE SOFT HARD

NOFILE   4096 8192

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files     

share|improve this answer

answered yesterday

BartBart

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1

I've figured it out.

On some kernels (e.g. 2.6.32+), at least on CentOS/RHEL, you can change the resource limits of a running process using /proc/<pid>/limits, e.g.:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            1024                 4096                 files     

To change the maximum open files to a soft limit of 4096, hard limit of 8192:

echo -n "Max open files=4096:8192" > /proc/23052/limits

This gives:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files

Note the -n in echo -n - without that, you'll get an "invalid argument" error.

The above doesn't always work, so

Another option is prlimit command, introduced with util-linux 2.21 allows you to read and change the limits of running processes.

This is a followup to the writable /proc/<pid>/limits, which was not integrated in mainline kernel. This solution should work.

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052

RESOURCE SOFT HARD

NOFILE   1024 4096

Set the limits:

$ prlimit --nofile=4096:8192 --pid 23052

Confirm:

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052RESOURCE SOFT HARD

NOFILE   4096 8192

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files     

share|improve this answer

answered yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

add a comment | 

1

I've figured it out.

On some kernels (e.g. 2.6.32+), at least on CentOS/RHEL, you can change the resource limits of a running process using /proc/<pid>/limits, e.g.:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            1024                 4096                 files     

To change the maximum open files to a soft limit of 4096, hard limit of 8192:

echo -n "Max open files=4096:8192" > /proc/23052/limits

This gives:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files

Note the -n in echo -n - without that, you'll get an "invalid argument" error.

The above doesn't always work, so

Another option is prlimit command, introduced with util-linux 2.21 allows you to read and change the limits of running processes.

This is a followup to the writable /proc/<pid>/limits, which was not integrated in mainline kernel. This solution should work.

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052

RESOURCE SOFT HARD

NOFILE   1024 4096

Set the limits:

$ prlimit --nofile=4096:8192 --pid 23052

Confirm:

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052RESOURCE SOFT HARD

NOFILE   4096 8192

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files     

share|improve this answer

answered yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

add a comment | 

I've figured it out.

On some kernels (e.g. 2.6.32+), at least on CentOS/RHEL, you can change the resource limits of a running process using /proc/<pid>/limits, e.g.:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            1024                 4096                 files     

To change the maximum open files to a soft limit of 4096, hard limit of 8192:

echo -n "Max open files=4096:8192" > /proc/23052/limits

This gives:

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files

Note the -n in echo -n - without that, you'll get an "invalid argument" error.

The above doesn't always work, so

Another option is prlimit command, introduced with util-linux 2.21 allows you to read and change the limits of running processes.

This is a followup to the writable /proc/<pid>/limits, which was not integrated in mainline kernel. This solution should work.

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052

RESOURCE SOFT HARD

NOFILE   1024 4096

Set the limits:

$ prlimit --nofile=4096:8192 --pid 23052

Confirm:

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052RESOURCE SOFT HARD

NOFILE   4096 8192

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files     

share|improve this answer

answered yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            1024                 4096                 files     

echo -n "Max open files=4096:8192" > /proc/23052/limits

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052

RESOURCE SOFT HARD

NOFILE   1024 4096

$ prlimit --nofile=4096:8192 --pid 23052

$ prlimit  --nofile --output RESOURCE,SOFT,HARD --pid 23052RESOURCE SOFT HARD

NOFILE   4096 8192

$ grep "open files" /proc/23052/limits

Limit                     Soft Limit           Hard Limit           Units     

Max open files            4096                 8192                 files     

share|improve this answer

answered yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

answered yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges

answered yesterday

BartBart

1,20411 gold badge33 silver badges1818 bronze badges