Styjun

Old short story where the future emperor of the galaxy is taken for a tour around Earth

Project Euler, problem # 9, Pythagorean triplet

Number of optically active compounds among the products of ozonolysis

Are L-functions uniquely determined by their values at negative integers?

Is this a plot hole in the Lost Mine of Phandelver adventure?

Why does linear regression use "vertical" distance to the best-fit-line, instead of actual distance?

What are some symbols representing peasants/oppressed persons fighting back?

Align by center of symbol

What is the standard dungeon scale at the table?

How long do Apple retain notifications to be pushed to iOS devices until they expire?

Why is the collector feedback bias popular in electret-mic preamp circuits?

How to make "plastic" sounding distored guitar

Does the Entangle spell require existing vegetation?

Can I activate an iPhone without an Apple ID?

Why does ffmpeg choose 10+20+20ms instead of an even 16ms for 60fps gifs?

How to fit a linear model in the Bayesian way in Mathematica?

Is it okay to retroactively change things when running a published adventure?

Mistakenly modified `/bin/sh'

I have accepted an internship offer. Should I inform companies I have applied to that have not gotten back to me yet?

Asking for higher salary after I increased my initial figure

Filtering fine silt/mud from water (not necessarily bacteria etc.)

Relationship between GCD, LCM and the Riemann Zeta function

Hot object in a vacuum

Are there any double stars that I can actually see orbit each other?

after some time my kubernetes cluster does not work

K8S: Node does not join clusterKubernetes pods (some) die after running for a dayFacing Issues with Kubernetes High Availability cluster setupConfigure Kubernetes for an Azure clusterThe connection to the server localhost:8080 was refusedk8s (single-node) not working after restartRunning a hybrid/heterogeneous Kubernetes cluster with nodes running in different networks using a VPNUnable to kubectl connect my kubernetes clusterKubernetes cluster without kubernetes MasterUsing kubeadm to init kubernetes 1.12.0 falied:node “xxx” not found

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

-2

I have kubernetes cluster.every thing work fine. but after 8 days when i run kubectl get pods it shows:

The connection to the server <host>:6443 was refused - did you specify the right host or port?

I have one master and one worker.
I run them in my lab without any cloud.

systemctl kubelet status
show **node not found**

my /etc/hosts was checked and it is correct

kubernetes

share|improve this question

edited Mar 26 at 12:14

yasin lachini

asked Mar 26 at 6:52

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You need to add a lot more information. How is your Kubernetes provisioned ? Are you using Microsoft Azure or Docker for Windows or what ? Where is your Kubernetes master ?
  
  – rjdkolb
  Mar 26 at 6:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Still very vague, how did you provision your "lab" ?
  
  – rjdkolb
  Mar 26 at 8:57
  

  
  
  
  

add a comment | 

-2

I have kubernetes cluster.every thing work fine. but after 8 days when i run kubectl get pods it shows:

The connection to the server <host>:6443 was refused - did you specify the right host or port?

I have one master and one worker.
I run them in my lab without any cloud.

systemctl kubelet status
show **node not found**

my /etc/hosts was checked and it is correct

kubernetes

share|improve this question

edited Mar 26 at 12:14

yasin lachini

asked Mar 26 at 6:52

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You need to add a lot more information. How is your Kubernetes provisioned ? Are you using Microsoft Azure or Docker for Windows or what ? Where is your Kubernetes master ?
  
  – rjdkolb
  Mar 26 at 6:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Still very vague, how did you provision your "lab" ?
  
  – rjdkolb
  Mar 26 at 8:57
  

  
  
  
  

add a comment | 

I have kubernetes cluster.every thing work fine. but after 8 days when i run kubectl get pods it shows:

The connection to the server <host>:6443 was refused - did you specify the right host or port?

I have one master and one worker.
I run them in my lab without any cloud.

systemctl kubelet status
show **node not found**

my /etc/hosts was checked and it is correct

kubernetes

share|improve this question

edited Mar 26 at 12:14

yasin lachini

asked Mar 26 at 6:52

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

The connection to the server <host>:6443 was refused - did you specify the right host or port?

systemctl kubelet status
show **node not found**

kubernetes

kubernetes

share|improve this question

edited Mar 26 at 12:14

yasin lachini

asked Mar 26 at 6:52

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

share|improve this question

edited Mar 26 at 12:14

yasin lachini

asked Mar 26 at 6:52

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

asked Mar 26 at 6:52

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

asked Mar 26 at 6:52

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

4 Answers
4

active

oldest

votes

1

i have lack of hardware. I run this command to solve the issue

sudo -i
swapoff -a
exit
strace -eopenat kubectl version

share|improve this answer

edited Mar 28 at 7:11

answered Mar 28 at 6:29

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

add a comment | 

0

most likely that the servers are rebooted. i had similar problem.
check kubelet logs on master server and take action.

if you can share the kubelet logs then we will be able to offer you further help

share|improve this answer

answered Mar 26 at 7:38

P EkambaramP Ekambaram

3,01811 gold badge88 silver badges2727 bronze badges

add a comment | 

0

Reboot itself should not be a problem - but if you did not disabled swap permanently reboot will enable swap again and API server will not launch - it could be first shot.

Second - check free disk space, API server will not respond if disk is full (will raise disk pressure event and will try to evict pods).

If it will not help - please add logs from Kubelet (systemctl and journalctl).

share|improve this answer

answered Mar 26 at 9:50

toszotoszo

7644 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i have lack of free ram
  
  – yasin lachini
  Mar 26 at 10:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  can it create problem?
  
  – yasin lachini
  Mar 26 at 10:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To run kubernetes master you need ~3GB of RAM and 2 CPU cores on the machine, so it could be a problem when system or other processes use memory and nothing left for K8s controlplane
  
  – toszo
  Mar 26 at 10:59
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i have 4 core and 8 Gb ram
  
  – yasin lachini
  Mar 26 at 11:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i ran mongodb redis elasticsearch on it
  
  – yasin lachini
  Mar 26 at 11:36
  

  
  
  
  

add a comment | 

0

verify /var/log/messages to get further information about the error

or

systemctl status kubelet

or

Alternately journalctl will also show the details.

share|improve this answer

answered Mar 26 at 12:11

Anil Jayan LeelaAnil Jayan Leela

4744 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  systemctl status kubelet shows node not found
  
  – yasin lachini
  Mar 26 at 12:13
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  please check the /etc/host entry . and check connecting to node from master manually. Is there a DNS server or manual host entry used
  
  – Anil Jayan Leela
  Mar 26 at 12:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i check it.it is correct
  
  – yasin lachini
  Mar 26 at 12:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if possible share the log messages
  
  – Anil Jayan Leela
  Mar 26 at 12:21
  

  
  
  
  

add a comment | 

Your Answer

StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
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
);



);

draft saved

draft discarded

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

Name

Email

Required, but never shown

StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55351325%2fafter-some-time-my-kubernetes-cluster-does-not-work%23new-answer', 'question_page');

);

Post as a guest

Name

Email

Required, but never shown

1

i have lack of hardware. I run this command to solve the issue

sudo -i
swapoff -a
exit
strace -eopenat kubectl version

share|improve this answer

edited Mar 28 at 7:11

answered Mar 28 at 6:29

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

add a comment | 

1

i have lack of hardware. I run this command to solve the issue

sudo -i
swapoff -a
exit
strace -eopenat kubectl version

share|improve this answer

edited Mar 28 at 7:11

answered Mar 28 at 6:29

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

add a comment | 

i have lack of hardware. I run this command to solve the issue

sudo -i
swapoff -a
exit
strace -eopenat kubectl version

share|improve this answer

edited Mar 28 at 7:11

answered Mar 28 at 6:29

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

sudo -i
swapoff -a
exit
strace -eopenat kubectl version

share|improve this answer

edited Mar 28 at 7:11

answered Mar 28 at 6:29

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

answered Mar 28 at 6:29

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

answered Mar 28 at 6:29

yasin lachiniyasin lachini

74111 gold badge33 silver badges1616 bronze badges

0

most likely that the servers are rebooted. i had similar problem.
check kubelet logs on master server and take action.

if you can share the kubelet logs then we will be able to offer you further help

share|improve this answer

answered Mar 26 at 7:38

P EkambaramP Ekambaram

3,01811 gold badge88 silver badges2727 bronze badges

add a comment | 

0

most likely that the servers are rebooted. i had similar problem.
check kubelet logs on master server and take action.

if you can share the kubelet logs then we will be able to offer you further help

share|improve this answer

answered Mar 26 at 7:38

P EkambaramP Ekambaram

3,01811 gold badge88 silver badges2727 bronze badges

add a comment | 

most likely that the servers are rebooted. i had similar problem.
check kubelet logs on master server and take action.

if you can share the kubelet logs then we will be able to offer you further help

share|improve this answer

answered Mar 26 at 7:38

P EkambaramP Ekambaram

3,01811 gold badge88 silver badges2727 bronze badges

share|improve this answer

answered Mar 26 at 7:38

P EkambaramP Ekambaram

3,01811 gold badge88 silver badges2727 bronze badges

answered Mar 26 at 7:38

P EkambaramP Ekambaram

3,01811 gold badge88 silver badges2727 bronze badges

answered Mar 26 at 7:38

P EkambaramP Ekambaram

3,01811 gold badge88 silver badges2727 bronze badges

0

Reboot itself should not be a problem - but if you did not disabled swap permanently reboot will enable swap again and API server will not launch - it could be first shot.

Second - check free disk space, API server will not respond if disk is full (will raise disk pressure event and will try to evict pods).

If it will not help - please add logs from Kubelet (systemctl and journalctl).

share|improve this answer

answered Mar 26 at 9:50

toszotoszo

7644 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i have lack of free ram
  
  – yasin lachini
  Mar 26 at 10:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  can it create problem?
  
  – yasin lachini
  Mar 26 at 10:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To run kubernetes master you need ~3GB of RAM and 2 CPU cores on the machine, so it could be a problem when system or other processes use memory and nothing left for K8s controlplane
  
  – toszo
  Mar 26 at 10:59
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i have 4 core and 8 Gb ram
  
  – yasin lachini
  Mar 26 at 11:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i ran mongodb redis elasticsearch on it
  
  – yasin lachini
  Mar 26 at 11:36
  

  
  
  
  

add a comment | 

0

Reboot itself should not be a problem - but if you did not disabled swap permanently reboot will enable swap again and API server will not launch - it could be first shot.

Second - check free disk space, API server will not respond if disk is full (will raise disk pressure event and will try to evict pods).

If it will not help - please add logs from Kubelet (systemctl and journalctl).

share|improve this answer

answered Mar 26 at 9:50

toszotoszo

7644 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i have lack of free ram
  
  – yasin lachini
  Mar 26 at 10:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  can it create problem?
  
  – yasin lachini
  Mar 26 at 10:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  To run kubernetes master you need ~3GB of RAM and 2 CPU cores on the machine, so it could be a problem when system or other processes use memory and nothing left for K8s controlplane
  
  – toszo
  Mar 26 at 10:59
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i have 4 core and 8 Gb ram
  
  – yasin lachini
  Mar 26 at 11:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i ran mongodb redis elasticsearch on it
  
  – yasin lachini
  Mar 26 at 11:36
  

  
  
  
  

add a comment | 

Reboot itself should not be a problem - but if you did not disabled swap permanently reboot will enable swap again and API server will not launch - it could be first shot.

Second - check free disk space, API server will not respond if disk is full (will raise disk pressure event and will try to evict pods).

If it will not help - please add logs from Kubelet (systemctl and journalctl).

share|improve this answer

answered Mar 26 at 9:50

toszotoszo

7644 bronze badges

share|improve this answer

answered Mar 26 at 9:50

toszotoszo

7644 bronze badges

answered Mar 26 at 9:50

toszotoszo

7644 bronze badges

answered Mar 26 at 9:50

toszotoszo

7644 bronze badges

0

verify /var/log/messages to get further information about the error

or

systemctl status kubelet

or

Alternately journalctl will also show the details.

share|improve this answer

answered Mar 26 at 12:11

Anil Jayan LeelaAnil Jayan Leela

4744 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  systemctl status kubelet shows node not found
  
  – yasin lachini
  Mar 26 at 12:13
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  please check the /etc/host entry . and check connecting to node from master manually. Is there a DNS server or manual host entry used
  
  – Anil Jayan Leela
  Mar 26 at 12:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i check it.it is correct
  
  – yasin lachini
  Mar 26 at 12:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if possible share the log messages
  
  – Anil Jayan Leela
  Mar 26 at 12:21
  

  
  
  
  

add a comment | 

0

verify /var/log/messages to get further information about the error

or

systemctl status kubelet

or

Alternately journalctl will also show the details.

share|improve this answer

answered Mar 26 at 12:11

Anil Jayan LeelaAnil Jayan Leela

4744 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  systemctl status kubelet shows node not found
  
  – yasin lachini
  Mar 26 at 12:13
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  please check the /etc/host entry . and check connecting to node from master manually. Is there a DNS server or manual host entry used
  
  – Anil Jayan Leela
  Mar 26 at 12:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i check it.it is correct
  
  – yasin lachini
  Mar 26 at 12:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if possible share the log messages
  
  – Anil Jayan Leela
  Mar 26 at 12:21
  

  
  
  
  

add a comment | 

verify /var/log/messages to get further information about the error

or

systemctl status kubelet

or

Alternately journalctl will also show the details.

share|improve this answer

answered Mar 26 at 12:11

Anil Jayan LeelaAnil Jayan Leela

4744 bronze badges

share|improve this answer

answered Mar 26 at 12:11

Anil Jayan LeelaAnil Jayan Leela

4744 bronze badges

answered Mar 26 at 12:11

Anil Jayan LeelaAnil Jayan Leela

4744 bronze badges

answered Mar 26 at 12:11

Anil Jayan LeelaAnil Jayan Leela

4744 bronze badges