What level is the value `ulimit -n`mean? user level or process level? [duplicate]
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Are limits.conf values applied on a per-process basis?
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I want to increase the ulimit -n value,so I add
* soft nofile 20000
* hard nofile 20000
in the /etc/security/limits.conf file, but there is a question confuse me all the time.
what level is the value ulimit -n mean? user level or process level?
Specifically speaking, if the value of ulimit -n is 512, and user testUser hava 3 process, does it means testUser can have the total file descriptors for 512 sum up for all his 3 process, or does it means each of testUser's process can have 512 file descriptors and thus testUser can hava a total file descriptors amount of 512*3?
linux files process ulimit
asked Dec 3 at 7:46
jacky
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marked as duplicate by Community♦ Dec 3 at 15:47
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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up vote
0
down vote
favorite
This question already has an answer here:
Are limits.conf values applied on a per-process basis?
1 answer
I want to increase the ulimit -n value,so I add
* soft nofile 20000
* hard nofile 20000
in the /etc/security/limits.conf file, but there is a question confuse me all the time.
what level is the value ulimit -n mean? user level or process level?
Specifically speaking, if the value of ulimit -n is 512, and user testUser hava 3 process, does it means testUser can have the total file descriptors for 512 sum up for all his 3 process, or does it means each of testUser's process can have 512 file descriptors and thus testUser can hava a total file descriptors amount of 512*3?
linux files process ulimit
asked Dec 3 at 7:46
jacky
1
New contributor
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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marked as duplicate by Community♦ Dec 3 at 15:47
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
This question already has an answer here:
Are limits.conf values applied on a per-process basis?
1 answer
I want to increase the ulimit -n value,so I add
* soft nofile 20000
* hard nofile 20000
in the /etc/security/limits.conf file, but there is a question confuse me all the time.
what level is the value ulimit -n mean? user level or process level?
Specifically speaking, if the value of ulimit -n is 512, and user testUser hava 3 process, does it means testUser can have the total file descriptors for 512 sum up for all his 3 process, or does it means each of testUser's process can have 512 file descriptors and thus testUser can hava a total file descriptors amount of 512*3?
linux files process ulimit
asked Dec 3 at 7:46
jacky
1
New contributor
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
This question already has an answer here:
Are limits.conf values applied on a per-process basis?
1 answer
I want to increase the ulimit -n value,so I add
* soft nofile 20000
* hard nofile 20000
in the /etc/security/limits.conf file, but there is a question confuse me all the time.
what level is the value ulimit -n mean? user level or process level?
Specifically speaking, if the value of ulimit -n is 512, and user testUser hava 3 process, does it means testUser can have the total file descriptors for 512 sum up for all his 3 process, or does it means each of testUser's process can have 512 file descriptors and thus testUser can hava a total file descriptors amount of 512*3?
This question already has an answer here:
Are limits.conf values applied on a per-process basis?
1 answer
linux files process ulimit
linux files process ulimit
asked Dec 3 at 7:46
jacky
1
New contributor
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 3 at 7:46
jacky
1
New contributor
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 3 at 7:46
jacky
1
New contributor
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 3 at 7:46
jacky
1
asked Dec 3 at 7:46
jacky
1
1
New contributor
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
jacky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
marked as duplicate by Community♦ Dec 3 at 15:47
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by Community♦ Dec 3 at 15:47
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
add a comment |
1 Answer
1
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The behaviour changes depend on if its a systemd service or not which i am not capable of pointing differences.
/etc/security/limits.conf file sets the limits for root user, if you would like to increase a user's limits, you should edit /etc/security/limits.d/testUser.conf file.
answered Dec 3 at 8:15
e73kiel
63
And what is the level ofulimit -ncontrol ? user or process?thanks
– jacky
Dec 3 at 8:33
-n The maximum number of open file descriptors. file descriptor: In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
– e73kiel
Dec 3 at 8:52
And as the example I mention in the question, iftestUserhave 3 process, what is the maxfile descriptoramount cantestUserget? 512 or 512*3?
– jacky
Dec 3 at 8:57
Are limits.conf values applied on a per-process basis?,this answer seems have the opposite point of view
– jacky
Dec 3 at 15:46
Man page linux.die.net/man/5/limits.conf says The pam_limits.so module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions.
– e73kiel
2 days ago
|
show 2 more comments
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
The behaviour changes depend on if its a systemd service or not which i am not capable of pointing differences.
/etc/security/limits.conf file sets the limits for root user, if you would like to increase a user's limits, you should edit /etc/security/limits.d/testUser.conf file.
answered Dec 3 at 8:15
e73kiel
63
And what is the level ofulimit -ncontrol ? user or process?thanks
– jacky
Dec 3 at 8:33
-n The maximum number of open file descriptors. file descriptor: In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
– e73kiel
Dec 3 at 8:52
And as the example I mention in the question, iftestUserhave 3 process, what is the maxfile descriptoramount cantestUserget? 512 or 512*3?
– jacky
Dec 3 at 8:57
Are limits.conf values applied on a per-process basis?,this answer seems have the opposite point of view
– jacky
Dec 3 at 15:46
Man page linux.die.net/man/5/limits.conf says The pam_limits.so module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions.
– e73kiel
2 days ago
|
show 2 more comments
up vote
0
down vote
The behaviour changes depend on if its a systemd service or not which i am not capable of pointing differences.
/etc/security/limits.conf file sets the limits for root user, if you would like to increase a user's limits, you should edit /etc/security/limits.d/testUser.conf file.
answered Dec 3 at 8:15
e73kiel
63
And what is the level ofulimit -ncontrol ? user or process?thanks
– jacky
Dec 3 at 8:33
-n The maximum number of open file descriptors. file descriptor: In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
– e73kiel
Dec 3 at 8:52
And as the example I mention in the question, iftestUserhave 3 process, what is the maxfile descriptoramount cantestUserget? 512 or 512*3?
– jacky
Dec 3 at 8:57
Are limits.conf values applied on a per-process basis?,this answer seems have the opposite point of view
– jacky
Dec 3 at 15:46
Man page linux.die.net/man/5/limits.conf says The pam_limits.so module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions.
– e73kiel
2 days ago
|
show 2 more comments
up vote
0
down vote
up vote
0
down vote
The behaviour changes depend on if its a systemd service or not which i am not capable of pointing differences.
/etc/security/limits.conf file sets the limits for root user, if you would like to increase a user's limits, you should edit /etc/security/limits.d/testUser.conf file.
answered Dec 3 at 8:15
e73kiel
63
The behaviour changes depend on if its a systemd service or not which i am not capable of pointing differences.
/etc/security/limits.conf file sets the limits for root user, if you would like to increase a user's limits, you should edit /etc/security/limits.d/testUser.conf file.
answered Dec 3 at 8:15
e73kiel
63
answered Dec 3 at 8:15
e73kiel
63
answered Dec 3 at 8:15
e73kiel
63
answered Dec 3 at 8:15
e73kiel
63
63
And what is the level ofulimit -ncontrol ? user or process?thanks
– jacky
Dec 3 at 8:33
-n The maximum number of open file descriptors. file descriptor: In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
– e73kiel
Dec 3 at 8:52
And as the example I mention in the question, iftestUserhave 3 process, what is the maxfile descriptoramount cantestUserget? 512 or 512*3?
– jacky
Dec 3 at 8:57
Are limits.conf values applied on a per-process basis?,this answer seems have the opposite point of view
– jacky
Dec 3 at 15:46
Man page linux.die.net/man/5/limits.conf says The pam_limits.so module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions.
– e73kiel
2 days ago
|
show 2 more comments
And what is the level ofulimit -ncontrol ? user or process?thanks
– jacky
Dec 3 at 8:33
-n The maximum number of open file descriptors. file descriptor: In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
– e73kiel
Dec 3 at 8:52
And as the example I mention in the question, iftestUserhave 3 process, what is the maxfile descriptoramount cantestUserget? 512 or 512*3?
– jacky
Dec 3 at 8:57
Are limits.conf values applied on a per-process basis?,this answer seems have the opposite point of view
– jacky
Dec 3 at 15:46
Man page linux.die.net/man/5/limits.conf says The pam_limits.so module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions.
– e73kiel
2 days ago
And what is the level of
ulimit -n control ? user or process?thanks– jacky
Dec 3 at 8:33
And what is the level of
ulimit -n control ? user or process?thanks– jacky
Dec 3 at 8:33
-n The maximum number of open file descriptors. file descriptor: In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
– e73kiel
Dec 3 at 8:52
-n The maximum number of open file descriptors. file descriptor: In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket.
– e73kiel
Dec 3 at 8:52
And as the example I mention in the question, if
testUser have 3 process, what is the max file descriptor amount can testUser get? 512 or 512*3?– jacky
Dec 3 at 8:57
And as the example I mention in the question, if
testUser have 3 process, what is the max file descriptor amount can testUser get? 512 or 512*3?– jacky
Dec 3 at 8:57
Are limits.conf values applied on a per-process basis?,this answer seems have the opposite point of view
– jacky
Dec 3 at 15:46
Are limits.conf values applied on a per-process basis?,this answer seems have the opposite point of view
– jacky
Dec 3 at 15:46
Man page linux.die.net/man/5/limits.conf says The pam_limits.so module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions.
– e73kiel
2 days ago
Man page linux.die.net/man/5/limits.conf says The pam_limits.so module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions.
– e73kiel
2 days ago
|
show 2 more comments
