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How do I configure configure keepalive on Centos7


How does tcp-keepalive work in ssh?How to configure network profiles in Centos?Configure systemd-journal-gateway on CentOS7Installing new NVIDIA driver failsdoes NFS overrides TCP keepalive time?In linux does “/proc/sys/net/ipv4/tcp_keepalive_time” has impact on both client & server?How to configure nodejs app to run via systemd on CentOS7?How can I configure a ip range in CentOS7?How do I make persistent tcp-keepalive setting in DebianCorrect way to configure CentOS7 NAT router?






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3















How and where do I configure configure TCP keepalive on CentOS 7?



My attempts to find it:



[michael@devserver ~]$ cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /run/sysctl.d/* | grep keep
cat: /run/sysctl.d/*: No such file or directory
[michael@devserver ~]$ cat /etc/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ ls /proc/sys/net/ipv4/ | grep tcp_keep
tcp_keepalive_intvl
tcp_keepalive_probes
tcp_keepalive_time
[michael@devserver ~]$ cat /proc/sys/net/ipv4/tcp_keep*
75
9
7200
[michael@devserver ~]$ whereis tcp_keepalive
tcp_keepalive:[michael@devserver ~]$ whereis tcp_keepalived
tcp_keepalived:[michael@devserver ~]$ whereis keepalive
keepalive:[michael@devserver ~]$ whereis keepalived
keepalived:[michael@devserver ~]$ ls /etc | grep keep
[michael@greenbeantech ~]$









share|improve this question
























  • You were on the right track with your first search: tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html

    – Jeff Schaller
    Jul 9 '17 at 0:49











  • @JeffSchaller Thanks Jeff! So, it is not a daemon which I original expected, right? Is it now standard build into the kernel? I seem to be able to write a new value using the "procfs"? interface. Is there not a conf file? The rest of the document described /etc/init.d/bla which doesn't apply to Centos 7 which uses systemctl, right?

    – user1032531
    Jul 9 '17 at 1:30


















3















How and where do I configure configure TCP keepalive on CentOS 7?



My attempts to find it:



[michael@devserver ~]$ cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /run/sysctl.d/* | grep keep
cat: /run/sysctl.d/*: No such file or directory
[michael@devserver ~]$ cat /etc/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ ls /proc/sys/net/ipv4/ | grep tcp_keep
tcp_keepalive_intvl
tcp_keepalive_probes
tcp_keepalive_time
[michael@devserver ~]$ cat /proc/sys/net/ipv4/tcp_keep*
75
9
7200
[michael@devserver ~]$ whereis tcp_keepalive
tcp_keepalive:[michael@devserver ~]$ whereis tcp_keepalived
tcp_keepalived:[michael@devserver ~]$ whereis keepalive
keepalive:[michael@devserver ~]$ whereis keepalived
keepalived:[michael@devserver ~]$ ls /etc | grep keep
[michael@greenbeantech ~]$









share|improve this question
























  • You were on the right track with your first search: tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html

    – Jeff Schaller
    Jul 9 '17 at 0:49











  • @JeffSchaller Thanks Jeff! So, it is not a daemon which I original expected, right? Is it now standard build into the kernel? I seem to be able to write a new value using the "procfs"? interface. Is there not a conf file? The rest of the document described /etc/init.d/bla which doesn't apply to Centos 7 which uses systemctl, right?

    – user1032531
    Jul 9 '17 at 1:30














3












3








3


0






How and where do I configure configure TCP keepalive on CentOS 7?



My attempts to find it:



[michael@devserver ~]$ cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /run/sysctl.d/* | grep keep
cat: /run/sysctl.d/*: No such file or directory
[michael@devserver ~]$ cat /etc/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ ls /proc/sys/net/ipv4/ | grep tcp_keep
tcp_keepalive_intvl
tcp_keepalive_probes
tcp_keepalive_time
[michael@devserver ~]$ cat /proc/sys/net/ipv4/tcp_keep*
75
9
7200
[michael@devserver ~]$ whereis tcp_keepalive
tcp_keepalive:[michael@devserver ~]$ whereis tcp_keepalived
tcp_keepalived:[michael@devserver ~]$ whereis keepalive
keepalive:[michael@devserver ~]$ whereis keepalived
keepalived:[michael@devserver ~]$ ls /etc | grep keep
[michael@greenbeantech ~]$









share|improve this question
















How and where do I configure configure TCP keepalive on CentOS 7?



My attempts to find it:



[michael@devserver ~]$ cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /run/sysctl.d/* | grep keep
cat: /run/sysctl.d/*: No such file or directory
[michael@devserver ~]$ cat /etc/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ ls /proc/sys/net/ipv4/ | grep tcp_keep
tcp_keepalive_intvl
tcp_keepalive_probes
tcp_keepalive_time
[michael@devserver ~]$ cat /proc/sys/net/ipv4/tcp_keep*
75
9
7200
[michael@devserver ~]$ whereis tcp_keepalive
tcp_keepalive:[michael@devserver ~]$ whereis tcp_keepalived
tcp_keepalived:[michael@devserver ~]$ whereis keepalive
keepalive:[michael@devserver ~]$ whereis keepalived
keepalived:[michael@devserver ~]$ ls /etc | grep keep
[michael@greenbeantech ~]$






centos configuration tcp






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jul 16 '17 at 12:40









Jeff Schaller

44.7k1163145




44.7k1163145










asked Jul 9 '17 at 0:23









user1032531user1032531

58011124




58011124












  • You were on the right track with your first search: tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html

    – Jeff Schaller
    Jul 9 '17 at 0:49











  • @JeffSchaller Thanks Jeff! So, it is not a daemon which I original expected, right? Is it now standard build into the kernel? I seem to be able to write a new value using the "procfs"? interface. Is there not a conf file? The rest of the document described /etc/init.d/bla which doesn't apply to Centos 7 which uses systemctl, right?

    – user1032531
    Jul 9 '17 at 1:30


















  • You were on the right track with your first search: tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html

    – Jeff Schaller
    Jul 9 '17 at 0:49











  • @JeffSchaller Thanks Jeff! So, it is not a daemon which I original expected, right? Is it now standard build into the kernel? I seem to be able to write a new value using the "procfs"? interface. Is there not a conf file? The rest of the document described /etc/init.d/bla which doesn't apply to Centos 7 which uses systemctl, right?

    – user1032531
    Jul 9 '17 at 1:30

















You were on the right track with your first search: tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html

– Jeff Schaller
Jul 9 '17 at 0:49





You were on the right track with your first search: tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html

– Jeff Schaller
Jul 9 '17 at 0:49













@JeffSchaller Thanks Jeff! So, it is not a daemon which I original expected, right? Is it now standard build into the kernel? I seem to be able to write a new value using the "procfs"? interface. Is there not a conf file? The rest of the document described /etc/init.d/bla which doesn't apply to Centos 7 which uses systemctl, right?

– user1032531
Jul 9 '17 at 1:30






@JeffSchaller Thanks Jeff! So, it is not a daemon which I original expected, right? Is it now standard build into the kernel? I seem to be able to write a new value using the "procfs"? interface. Is there not a conf file? The rest of the document described /etc/init.d/bla which doesn't apply to Centos 7 which uses systemctl, right?

– user1032531
Jul 9 '17 at 1:30











1 Answer
1






active

oldest

votes


















2














The TCP Keepalive HOWTO refers to two methods for configuring TCP keepalives:



  • the procfs interface


  • the sysctl interface


As you already found, you can update the values by writing a new number to the corresponding /proc file, for example:



echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time


or via sysctl:



sysctl -w net.ipv4.tcp_keepalive_time=600


... although neither of those changes survive a reboot.



To make the change persist across reboots, you want to place the values in (or via) /etc/sysctl.conf. I don't have a CentOS system in front of me, but it's possible that /etc/sysctl.conf is linked to from a file in /etc/sysctl.d/.



My recommendation would be to create a file in /etc/sysctl.d/ with contents in the format:



net.ipv4.tcp_keepalive_time=7200
net.ipv4.tcp_keepalive_intvl=75
net.ipv4.tcp_keepalive_probes=9


The sysctl files are read in numeric order, so if you want your values to take precedence, heed the warning you already saw:




To override only specific settings, add a file with a lexically later
name in /etc/sysctl.d/ and put new settings there.







share|improve this answer

























  • Thanks Jeff. As described in my initial post, I already looked in /etc/sysctl.conf and /etc/sysctl.d/, but nothing related to keepalive. I just recently tried sudo grep -r /etc -e tcp_keepalive_time, and it returns no results. I've also tried just using part of the work (i.e. "keepalive"), but still doesn't seem to be specified in /etc/ anywhere.

    – user1032531
    Jul 11 '17 at 14:18












  • Then you have the default settings; I assumed you were looking to override them.

    – Jeff Schaller
    Jul 11 '17 at 15:10











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














The TCP Keepalive HOWTO refers to two methods for configuring TCP keepalives:



  • the procfs interface


  • the sysctl interface


As you already found, you can update the values by writing a new number to the corresponding /proc file, for example:



echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time


or via sysctl:



sysctl -w net.ipv4.tcp_keepalive_time=600


... although neither of those changes survive a reboot.



To make the change persist across reboots, you want to place the values in (or via) /etc/sysctl.conf. I don't have a CentOS system in front of me, but it's possible that /etc/sysctl.conf is linked to from a file in /etc/sysctl.d/.



My recommendation would be to create a file in /etc/sysctl.d/ with contents in the format:



net.ipv4.tcp_keepalive_time=7200
net.ipv4.tcp_keepalive_intvl=75
net.ipv4.tcp_keepalive_probes=9


The sysctl files are read in numeric order, so if you want your values to take precedence, heed the warning you already saw:




To override only specific settings, add a file with a lexically later
name in /etc/sysctl.d/ and put new settings there.







share|improve this answer

























  • Thanks Jeff. As described in my initial post, I already looked in /etc/sysctl.conf and /etc/sysctl.d/, but nothing related to keepalive. I just recently tried sudo grep -r /etc -e tcp_keepalive_time, and it returns no results. I've also tried just using part of the work (i.e. "keepalive"), but still doesn't seem to be specified in /etc/ anywhere.

    – user1032531
    Jul 11 '17 at 14:18












  • Then you have the default settings; I assumed you were looking to override them.

    – Jeff Schaller
    Jul 11 '17 at 15:10















2














The TCP Keepalive HOWTO refers to two methods for configuring TCP keepalives:



  • the procfs interface


  • the sysctl interface


As you already found, you can update the values by writing a new number to the corresponding /proc file, for example:



echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time


or via sysctl:



sysctl -w net.ipv4.tcp_keepalive_time=600


... although neither of those changes survive a reboot.



To make the change persist across reboots, you want to place the values in (or via) /etc/sysctl.conf. I don't have a CentOS system in front of me, but it's possible that /etc/sysctl.conf is linked to from a file in /etc/sysctl.d/.



My recommendation would be to create a file in /etc/sysctl.d/ with contents in the format:



net.ipv4.tcp_keepalive_time=7200
net.ipv4.tcp_keepalive_intvl=75
net.ipv4.tcp_keepalive_probes=9


The sysctl files are read in numeric order, so if you want your values to take precedence, heed the warning you already saw:




To override only specific settings, add a file with a lexically later
name in /etc/sysctl.d/ and put new settings there.







share|improve this answer

























  • Thanks Jeff. As described in my initial post, I already looked in /etc/sysctl.conf and /etc/sysctl.d/, but nothing related to keepalive. I just recently tried sudo grep -r /etc -e tcp_keepalive_time, and it returns no results. I've also tried just using part of the work (i.e. "keepalive"), but still doesn't seem to be specified in /etc/ anywhere.

    – user1032531
    Jul 11 '17 at 14:18












  • Then you have the default settings; I assumed you were looking to override them.

    – Jeff Schaller
    Jul 11 '17 at 15:10













2












2








2







The TCP Keepalive HOWTO refers to two methods for configuring TCP keepalives:



  • the procfs interface


  • the sysctl interface


As you already found, you can update the values by writing a new number to the corresponding /proc file, for example:



echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time


or via sysctl:



sysctl -w net.ipv4.tcp_keepalive_time=600


... although neither of those changes survive a reboot.



To make the change persist across reboots, you want to place the values in (or via) /etc/sysctl.conf. I don't have a CentOS system in front of me, but it's possible that /etc/sysctl.conf is linked to from a file in /etc/sysctl.d/.



My recommendation would be to create a file in /etc/sysctl.d/ with contents in the format:



net.ipv4.tcp_keepalive_time=7200
net.ipv4.tcp_keepalive_intvl=75
net.ipv4.tcp_keepalive_probes=9


The sysctl files are read in numeric order, so if you want your values to take precedence, heed the warning you already saw:




To override only specific settings, add a file with a lexically later
name in /etc/sysctl.d/ and put new settings there.







share|improve this answer















The TCP Keepalive HOWTO refers to two methods for configuring TCP keepalives:



  • the procfs interface


  • the sysctl interface


As you already found, you can update the values by writing a new number to the corresponding /proc file, for example:



echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time


or via sysctl:



sysctl -w net.ipv4.tcp_keepalive_time=600


... although neither of those changes survive a reboot.



To make the change persist across reboots, you want to place the values in (or via) /etc/sysctl.conf. I don't have a CentOS system in front of me, but it's possible that /etc/sysctl.conf is linked to from a file in /etc/sysctl.d/.



My recommendation would be to create a file in /etc/sysctl.d/ with contents in the format:



net.ipv4.tcp_keepalive_time=7200
net.ipv4.tcp_keepalive_intvl=75
net.ipv4.tcp_keepalive_probes=9


The sysctl files are read in numeric order, so if you want your values to take precedence, heed the warning you already saw:




To override only specific settings, add a file with a lexically later
name in /etc/sysctl.d/ and put new settings there.








share|improve this answer














share|improve this answer



share|improve this answer








edited Mar 27 at 14:14

























answered Jul 10 '17 at 12:58









Jeff SchallerJeff Schaller

44.7k1163145




44.7k1163145












  • Thanks Jeff. As described in my initial post, I already looked in /etc/sysctl.conf and /etc/sysctl.d/, but nothing related to keepalive. I just recently tried sudo grep -r /etc -e tcp_keepalive_time, and it returns no results. I've also tried just using part of the work (i.e. "keepalive"), but still doesn't seem to be specified in /etc/ anywhere.

    – user1032531
    Jul 11 '17 at 14:18












  • Then you have the default settings; I assumed you were looking to override them.

    – Jeff Schaller
    Jul 11 '17 at 15:10

















  • Thanks Jeff. As described in my initial post, I already looked in /etc/sysctl.conf and /etc/sysctl.d/, but nothing related to keepalive. I just recently tried sudo grep -r /etc -e tcp_keepalive_time, and it returns no results. I've also tried just using part of the work (i.e. "keepalive"), but still doesn't seem to be specified in /etc/ anywhere.

    – user1032531
    Jul 11 '17 at 14:18












  • Then you have the default settings; I assumed you were looking to override them.

    – Jeff Schaller
    Jul 11 '17 at 15:10
















Thanks Jeff. As described in my initial post, I already looked in /etc/sysctl.conf and /etc/sysctl.d/, but nothing related to keepalive. I just recently tried sudo grep -r /etc -e tcp_keepalive_time, and it returns no results. I've also tried just using part of the work (i.e. "keepalive"), but still doesn't seem to be specified in /etc/ anywhere.

– user1032531
Jul 11 '17 at 14:18






Thanks Jeff. As described in my initial post, I already looked in /etc/sysctl.conf and /etc/sysctl.d/, but nothing related to keepalive. I just recently tried sudo grep -r /etc -e tcp_keepalive_time, and it returns no results. I've also tried just using part of the work (i.e. "keepalive"), but still doesn't seem to be specified in /etc/ anywhere.

– user1032531
Jul 11 '17 at 14:18














Then you have the default settings; I assumed you were looking to override them.

– Jeff Schaller
Jul 11 '17 at 15:10





Then you have the default settings; I assumed you were looking to override them.

– Jeff Schaller
Jul 11 '17 at 15:10

















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