Very slow login, logout and su on Centos 6.8
It's been two weeks that ssh login, logout and using su to other users on a CentOS 6.8 server been very slow, it takes around 20 seconds to 45 seconds for the login or logout or su to take effect. All my other servers are working fine, just three of my servers with same usage been affected by this problem.
In sshd_config the UseDNS and GSSAPIAuthentication are equal to no.
The /var/log/messages and /var/log/secure are empty as well since 2 weeks ago and nothing writes to these two files. The rsyslog.conf is on its defaults configuration and nothing been modified on the configuration file but all of a sudden nothing been writing on these two files.
When I use crontab -e it takes around 15 seconds to open the file, and it's empty.
I tried ssh -vvv user@host from a different system to connect to this problematic server. After I insert the password it waits 30 seconds on the following lines then logs in:
debug3: packet_send2: adding 48 (len 70 padlen 10 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug3: Wrote 144 bytes for a total of 1709
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug3: Wrote 128 bytes for a total of 1837
CPU and Memory usage are all normal on the system. The uptime command shows 16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26.
The disks are fine and there is lots of free space.
Any ideas what's causing the slow ssh login, logout and su?
ssh login slowdown
edited Mar 6 at 12:11
roaima
45.9k758124
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
|
show 11 more comments
It's been two weeks that ssh login, logout and using su to other users on a CentOS 6.8 server been very slow, it takes around 20 seconds to 45 seconds for the login or logout or su to take effect. All my other servers are working fine, just three of my servers with same usage been affected by this problem.
In sshd_config the UseDNS and GSSAPIAuthentication are equal to no.
The /var/log/messages and /var/log/secure are empty as well since 2 weeks ago and nothing writes to these two files. The rsyslog.conf is on its defaults configuration and nothing been modified on the configuration file but all of a sudden nothing been writing on these two files.
When I use crontab -e it takes around 15 seconds to open the file, and it's empty.
I tried ssh -vvv user@host from a different system to connect to this problematic server. After I insert the password it waits 30 seconds on the following lines then logs in:
debug3: packet_send2: adding 48 (len 70 padlen 10 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug3: Wrote 144 bytes for a total of 1709
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug3: Wrote 128 bytes for a total of 1837
CPU and Memory usage are all normal on the system. The uptime command shows 16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26.
The disks are fine and there is lots of free space.
Any ideas what's causing the slow ssh login, logout and su?
ssh login slowdown
edited Mar 6 at 12:11
roaima
45.9k758124
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
1
Might be something in login and logout scripts like~/.bashrcand~/.bash_logout(or global ones in/etc). What happens when you try to login usingssh -t <host> bash --noprofile --norc
– Lambert
Mar 5 at 9:10
bashrc and bash_logout and bash_profile are their default values
– Ali Golestan
Mar 5 at 9:14
i used your suggestion but still it takes time to ssh to other server
– Ali Golestan
Mar 5 at 9:17
2
Can the host access the configured DNS servers? Is there an NFS export mounted and is quota being checked?
– Lambert
Mar 5 at 9:18
1
@roaima this is the result of the uptime command16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26the disks are fine and there are lots of free space
– Ali Golestan
Mar 5 at 13:29
|
show 11 more comments
It's been two weeks that ssh login, logout and using su to other users on a CentOS 6.8 server been very slow, it takes around 20 seconds to 45 seconds for the login or logout or su to take effect. All my other servers are working fine, just three of my servers with same usage been affected by this problem.
In sshd_config the UseDNS and GSSAPIAuthentication are equal to no.
The /var/log/messages and /var/log/secure are empty as well since 2 weeks ago and nothing writes to these two files. The rsyslog.conf is on its defaults configuration and nothing been modified on the configuration file but all of a sudden nothing been writing on these two files.
When I use crontab -e it takes around 15 seconds to open the file, and it's empty.
I tried ssh -vvv user@host from a different system to connect to this problematic server. After I insert the password it waits 30 seconds on the following lines then logs in:
debug3: packet_send2: adding 48 (len 70 padlen 10 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug3: Wrote 144 bytes for a total of 1709
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug3: Wrote 128 bytes for a total of 1837
CPU and Memory usage are all normal on the system. The uptime command shows 16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26.
The disks are fine and there is lots of free space.
Any ideas what's causing the slow ssh login, logout and su?
ssh login slowdown
edited Mar 6 at 12:11
roaima
45.9k758124
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
It's been two weeks that ssh login, logout and using su to other users on a CentOS 6.8 server been very slow, it takes around 20 seconds to 45 seconds for the login or logout or su to take effect. All my other servers are working fine, just three of my servers with same usage been affected by this problem.
In sshd_config the UseDNS and GSSAPIAuthentication are equal to no.
The /var/log/messages and /var/log/secure are empty as well since 2 weeks ago and nothing writes to these two files. The rsyslog.conf is on its defaults configuration and nothing been modified on the configuration file but all of a sudden nothing been writing on these two files.
When I use crontab -e it takes around 15 seconds to open the file, and it's empty.
I tried ssh -vvv user@host from a different system to connect to this problematic server. After I insert the password it waits 30 seconds on the following lines then logs in:
debug3: packet_send2: adding 48 (len 70 padlen 10 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug3: Wrote 144 bytes for a total of 1709
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug3: Wrote 128 bytes for a total of 1837
CPU and Memory usage are all normal on the system. The uptime command shows 16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26.
The disks are fine and there is lots of free space.
Any ideas what's causing the slow ssh login, logout and su?
ssh login slowdown
ssh login slowdown
edited Mar 6 at 12:11
roaima
45.9k758124
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
edited Mar 6 at 12:11
roaima
45.9k758124
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
edited Mar 6 at 12:11
roaima
45.9k758124
edited Mar 6 at 12:11
roaima
45.9k758124
edited Mar 6 at 12:11
roaima
45.9k758124
45.9k758124
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
asked Mar 5 at 9:01
Ali GolestanAli Golestan
94215
94215
1
Might be something in login and logout scripts like~/.bashrcand~/.bash_logout(or global ones in/etc). What happens when you try to login usingssh -t <host> bash --noprofile --norc
– Lambert
Mar 5 at 9:10
bashrc and bash_logout and bash_profile are their default values
– Ali Golestan
Mar 5 at 9:14
i used your suggestion but still it takes time to ssh to other server
– Ali Golestan
Mar 5 at 9:17
2
Can the host access the configured DNS servers? Is there an NFS export mounted and is quota being checked?
– Lambert
Mar 5 at 9:18
1
@roaima this is the result of the uptime command16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26the disks are fine and there are lots of free space
– Ali Golestan
Mar 5 at 13:29
|
show 11 more comments
1
Might be something in login and logout scripts like~/.bashrcand~/.bash_logout(or global ones in/etc). What happens when you try to login usingssh -t <host> bash --noprofile --norc
– Lambert
Mar 5 at 9:10
bashrc and bash_logout and bash_profile are their default values
– Ali Golestan
Mar 5 at 9:14
i used your suggestion but still it takes time to ssh to other server
– Ali Golestan
Mar 5 at 9:17
2
Can the host access the configured DNS servers? Is there an NFS export mounted and is quota being checked?
– Lambert
Mar 5 at 9:18
1
@roaima this is the result of the uptime command16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26the disks are fine and there are lots of free space
– Ali Golestan
Mar 5 at 13:29
1
1
Might be something in login and logout scripts like
~/.bashrc and ~/.bash_logout (or global ones in /etc). What happens when you try to login using ssh -t <host> bash --noprofile --norc– Lambert
Mar 5 at 9:10
Might be something in login and logout scripts like
~/.bashrc and ~/.bash_logout (or global ones in /etc). What happens when you try to login using ssh -t <host> bash --noprofile --norc– Lambert
Mar 5 at 9:10
bashrc and bash_logout and bash_profile are their default values
– Ali Golestan
Mar 5 at 9:14
bashrc and bash_logout and bash_profile are their default values
– Ali Golestan
Mar 5 at 9:14
i used your suggestion but still it takes time to ssh to other server
– Ali Golestan
Mar 5 at 9:17
i used your suggestion but still it takes time to ssh to other server
– Ali Golestan
Mar 5 at 9:17
2
2
Can the host access the configured DNS servers? Is there an NFS export mounted and is quota being checked?
– Lambert
Mar 5 at 9:18
Can the host access the configured DNS servers? Is there an NFS export mounted and is quota being checked?
– Lambert
Mar 5 at 9:18
1
1
@roaima this is the result of the uptime command
16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26 the disks are fine and there are lots of free space– Ali Golestan
Mar 5 at 13:29
@roaima this is the result of the uptime command
16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26 the disks are fine and there are lots of free space– Ali Golestan
Mar 5 at 13:29
|
show 11 more comments
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f504432%2fvery-slow-login-logout-and-su-on-centos-6-8%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f504432%2fvery-slow-login-logout-and-su-on-centos-6-8%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
Might be something in login and logout scripts like
~/.bashrcand~/.bash_logout(or global ones in/etc). What happens when you try to login usingssh -t <host> bash --noprofile --norc– Lambert
Mar 5 at 9:10
bashrc and bash_logout and bash_profile are their default values
– Ali Golestan
Mar 5 at 9:14
i used your suggestion but still it takes time to ssh to other server
– Ali Golestan
Mar 5 at 9:17
2
Can the host access the configured DNS servers? Is there an NFS export mounted and is quota being checked?
– Lambert
Mar 5 at 9:18
1
@roaima this is the result of the uptime command
16:58:44 up 12 days, 4:21, 5 users, load average: 0.22, 0.23, 0.26the disks are fine and there are lots of free space– Ali Golestan
Mar 5 at 13:29