Why is dhclient + systemd-resolved restarting frequently?
I'm running an ubuntu server in aws on VERSION="18.10 (Cosmic Cuttlefish)"
We've been having intermittent dns resolution issues, and while looking into that I've seen that every 20 minutes or so I'm seeing the following in syslog
Mar 19 00:17:03 localhost dhclient[815]: DHCPREQUEST of 172.31.26.85 on eth0 to 172.31.16.1 port 67 (xid=0x7d329bb3)
Mar 19 00:17:03 localhost dhclient[815]: DHCPACK of 172.31.26.85 from 172.31.16.1
Mar 19 00:17:03 localhost systemd[1]: Stopping Network Name Resolution...
Mar 19 00:17:03 localhost systemd[1]: Stopped Network Name Resolution.
Mar 19 00:17:03 localhost systemd[1]: Starting Network Name Resolution...
Mar 19 00:17:04 localhost dhclient[815]: bound to 172.31.26.85 -- renewal in 1747 seconds.
It seems every time dhclient goes through a renewal process it causes systemd-resolved to restart, which momentarily makes dns resolution not work. So if some process was running at that time, the resolution may fail.
I'm not really sure where to begin on this. Is it normal for dhclient to cause systemd-resolved to restart so frequently? What's the right solution to this issue? Should I force dhclient to renew much less frequently, does that have some negative impact? Any other suggestions?
networking dns display-resolution dhcp systemd-resolved
New contributor
add a comment |
I'm running an ubuntu server in aws on VERSION="18.10 (Cosmic Cuttlefish)"
We've been having intermittent dns resolution issues, and while looking into that I've seen that every 20 minutes or so I'm seeing the following in syslog
Mar 19 00:17:03 localhost dhclient[815]: DHCPREQUEST of 172.31.26.85 on eth0 to 172.31.16.1 port 67 (xid=0x7d329bb3)
Mar 19 00:17:03 localhost dhclient[815]: DHCPACK of 172.31.26.85 from 172.31.16.1
Mar 19 00:17:03 localhost systemd[1]: Stopping Network Name Resolution...
Mar 19 00:17:03 localhost systemd[1]: Stopped Network Name Resolution.
Mar 19 00:17:03 localhost systemd[1]: Starting Network Name Resolution...
Mar 19 00:17:04 localhost dhclient[815]: bound to 172.31.26.85 -- renewal in 1747 seconds.
It seems every time dhclient goes through a renewal process it causes systemd-resolved to restart, which momentarily makes dns resolution not work. So if some process was running at that time, the resolution may fail.
I'm not really sure where to begin on this. Is it normal for dhclient to cause systemd-resolved to restart so frequently? What's the right solution to this issue? Should I force dhclient to renew much less frequently, does that have some negative impact? Any other suggestions?
networking dns display-resolution dhcp systemd-resolved
New contributor
1
"renewal in 1747 seconds" suggests maybe the network's DHCP server is configured to offer ~30 minute lease durations?
– steeldriver
1 hour ago
add a comment |
I'm running an ubuntu server in aws on VERSION="18.10 (Cosmic Cuttlefish)"
We've been having intermittent dns resolution issues, and while looking into that I've seen that every 20 minutes or so I'm seeing the following in syslog
Mar 19 00:17:03 localhost dhclient[815]: DHCPREQUEST of 172.31.26.85 on eth0 to 172.31.16.1 port 67 (xid=0x7d329bb3)
Mar 19 00:17:03 localhost dhclient[815]: DHCPACK of 172.31.26.85 from 172.31.16.1
Mar 19 00:17:03 localhost systemd[1]: Stopping Network Name Resolution...
Mar 19 00:17:03 localhost systemd[1]: Stopped Network Name Resolution.
Mar 19 00:17:03 localhost systemd[1]: Starting Network Name Resolution...
Mar 19 00:17:04 localhost dhclient[815]: bound to 172.31.26.85 -- renewal in 1747 seconds.
It seems every time dhclient goes through a renewal process it causes systemd-resolved to restart, which momentarily makes dns resolution not work. So if some process was running at that time, the resolution may fail.
I'm not really sure where to begin on this. Is it normal for dhclient to cause systemd-resolved to restart so frequently? What's the right solution to this issue? Should I force dhclient to renew much less frequently, does that have some negative impact? Any other suggestions?
networking dns display-resolution dhcp systemd-resolved
New contributor
I'm running an ubuntu server in aws on VERSION="18.10 (Cosmic Cuttlefish)"
We've been having intermittent dns resolution issues, and while looking into that I've seen that every 20 minutes or so I'm seeing the following in syslog
Mar 19 00:17:03 localhost dhclient[815]: DHCPREQUEST of 172.31.26.85 on eth0 to 172.31.16.1 port 67 (xid=0x7d329bb3)
Mar 19 00:17:03 localhost dhclient[815]: DHCPACK of 172.31.26.85 from 172.31.16.1
Mar 19 00:17:03 localhost systemd[1]: Stopping Network Name Resolution...
Mar 19 00:17:03 localhost systemd[1]: Stopped Network Name Resolution.
Mar 19 00:17:03 localhost systemd[1]: Starting Network Name Resolution...
Mar 19 00:17:04 localhost dhclient[815]: bound to 172.31.26.85 -- renewal in 1747 seconds.
It seems every time dhclient goes through a renewal process it causes systemd-resolved to restart, which momentarily makes dns resolution not work. So if some process was running at that time, the resolution may fail.
I'm not really sure where to begin on this. Is it normal for dhclient to cause systemd-resolved to restart so frequently? What's the right solution to this issue? Should I force dhclient to renew much less frequently, does that have some negative impact? Any other suggestions?
networking dns display-resolution dhcp systemd-resolved
networking dns display-resolution dhcp systemd-resolved
New contributor
New contributor
New contributor
asked 1 hour ago
user3005200user3005200
1
1
New contributor
New contributor
1
"renewal in 1747 seconds" suggests maybe the network's DHCP server is configured to offer ~30 minute lease durations?
– steeldriver
1 hour ago
add a comment |
1
"renewal in 1747 seconds" suggests maybe the network's DHCP server is configured to offer ~30 minute lease durations?
– steeldriver
1 hour ago
1
1
"renewal in 1747 seconds" suggests maybe the network's DHCP server is configured to offer ~30 minute lease durations?
– steeldriver
1 hour ago
"renewal in 1747 seconds" suggests maybe the network's DHCP server is configured to offer ~30 minute lease durations?
– steeldriver
1 hour ago
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
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: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
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
});
}
});
user3005200 is a new contributor. Be nice, and check out our Code of Conduct.
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%2faskubuntu.com%2fquestions%2f1127069%2fwhy-is-dhclient-systemd-resolved-restarting-frequently%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
user3005200 is a new contributor. Be nice, and check out our Code of Conduct.
user3005200 is a new contributor. Be nice, and check out our Code of Conduct.
user3005200 is a new contributor. Be nice, and check out our Code of Conduct.
user3005200 is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Ask Ubuntu!
- 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%2faskubuntu.com%2fquestions%2f1127069%2fwhy-is-dhclient-systemd-resolved-restarting-frequently%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
"renewal in 1747 seconds" suggests maybe the network's DHCP server is configured to offer ~30 minute lease durations?
– steeldriver
1 hour ago