Not able to link master with Node

[arorakshitij]

I am getting following error while trying to link master with Node.
[preflight] Some fatal errors occurred:
[ERROR DirAvailable--etc-kubernetes-manifests]: /etc/kubernetes/manifests is not empty
[ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists
[ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists
[ERROR Port-10250]: Port 10250 is in use
[preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=...

Please help.

Regards
Kshitij

[shaikkhajaibrahim]

Did you performed any command twice ?.

Port 10250 is in use is creating that doubt. Can you list all the steps you performed

[arorakshitij]

I had followed the following document
https://kubernetes.io/docs/tasks/tools/install-kubeadm/

with following steps:-

1. Created a T2 large machine for master

2. Changed the user to sudo userusing "sudo -i"

3. Later followed the commands
   3.1 apt-get update
   3.2 apt-get install -y apt-transport-https ca-certificates curl software-properties-common
   3.3 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
   3.4 add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable"
   3.5 apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}')
   3.6 apt-get update && apt-get install -y apt-transport-https curl
   3.7 curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
   3.8 cat </etc/apt/sources.list.d/kubernetes.list
   deb http://apt.kubernetes.io/ kubernetes-xenial main
   EOF
   3.9 apt-get update
   3.10 apt-get install -y kubelet kubeadm kubectl

4. Ran the command Kubeadm init

5. Logged out from root user using "exit"

6. Ran following commands as regular user
   6.1 mkdir -p $HOME/.kube
   6.2 sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
   6.3 sudo chown $(id -u):$(id -g) $HOME/.kube/config

7. Created 2 T2.micro machines

8. Changed the user to sudo userusing "sudo -i"

9. Later followed the commands
   9.1 apt-get update
   9.2 apt-get install -y apt-transport-https ca-certificates curl software-properties-common
   9.3 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
   9.4 add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable"
   9.5 apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}')
   9.6 apt-get update && apt-get install -y apt-transport-https curl
   9.7 curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
   9.8 cat </etc/apt/sources.list.d/kubernetes.list
   deb http://apt.kubernetes.io/ kubernetes-xenial main
   EOF
   9.9 apt-get update
   9.10 apt-get install -y kubelet kubeadm kubectl

10. Logged out from the machine

11. Logged in to the master machine

12. Changed the user to root user

13. Executed the command "kubeadm join 172.31.15.176:6443 --token sv8sg0.wkplhwfh8paf7vax --discovery-token-ca-cert-hash sha256:ae51539cc3fb04d1f0de5d1989f7a2d1391abee0599f3522cbf3f9251a621cde"

14. Got Error
    [preflight] running pre-flight checks
    I0702 11:13:24.591266 14385 kernel_validator.go:81] Validating kernel version
    I0702 11:13:24.591406 14385 kernel_validator.go:96] Validating kernel config
    [preflight] Some fatal errors occurred:
    [ERROR DirAvailable--etc-kubernetes-manifests]: /etc/kubernetes/manifests is not empty
    [ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists
    [ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists
    [ERROR Port-10250]: Port 10250 is in use
    [preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=...

[shaikkhajaibrahim]

Can you share your security group. You have to open tcp & udp ports

…

________________________________ From: arorakshitij <notifications@github.com> Sent: 02 July 2018 16:57 To: asquarezone/KubernetesZone Cc: shaikkhajaibrahim; Comment Subject: Re: [asquarezone/KubernetesZone] Not able to link master with Node (#2) I had followed the following document https://kubernetes.io/docs/tasks/tools/install-kubeadm/ with following steps:- 1. Created a T2 large machine for master 2. Changed the user to sudo userusing "sudo -i" 3. Later followed the commands 3.1 apt-get update 3.2 apt-get install -y apt-transport-https ca-certificates curl software-properties-common 3.3 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - 3.4 add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable" 3.5 apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}') 3.6 apt-get update && apt-get install -y apt-transport-https curl 3.7 curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - 3.8 cat </etc/apt/sources.list.d/kubernetes.list deb http://apt.kubernetes.io/ kubernetes-xenial main EOF 3.9 apt-get update 3.10 apt-get install -y kubelet kubeadm kubectl 4. Ran the command Kubeadm init 5. Logged out from root user using "exit" 6. Ran following commands as regular user 6.1 mkdir -p $HOME/.kube 6.2 sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config 6.3 sudo chown $(id -u):$(id -g) $HOME/.kube/config 7. Created 2 T2.micro machines 8. Changed the user to sudo userusing "sudo -i" 9. Later followed the commands 9.1 apt-get update 9.2 apt-get install -y apt-transport-https ca-certificates curl software-properties-common 9.3 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - 9.4 add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable" 9.5 apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}') 9.6 apt-get update && apt-get install -y apt-transport-https curl 9.7 curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - 9.8 cat </etc/apt/sources.list.d/kubernetes.list deb http://apt.kubernetes.io/ kubernetes-xenial main EOF 9.9 apt-get update 9.10 apt-get install -y kubelet kubeadm kubectl 10. Logged out from the machine 11. Logged in to the master machine 12. Changed the user to root user 13. Executed the command "kubeadm join 172.31.15.176:6443 --token sv8sg0.wkplhwfh8paf7vax --discovery-token-ca-cert-hash sha256:ae51539cc3fb04d1f0de5d1989f7a2d1391abee0599f3522cbf3f9251a621cde" 14. Got Error [preflight] running pre-flight checks I0702 11:13:24.591266 14385 kernel_validator.go:81] Validating kernel version I0702 11:13:24.591406 14385 kernel_validator.go:96] Validating kernel config [preflight] Some fatal errors occurred: [ERROR DirAvailable--etc-kubernetes-manifests]: /etc/kubernetes/manifests is not empty [ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists [ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists [ERROR Port-10250]: Port 10250 is in use [preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=... — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#2 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/ACU0rSEctZ4aeBtSIhfBnQFVn9sv7Jajks5uCgObgaJpZM4U-Yru>.

[satyamuralidhar]

[ERROR DirAvailable--etc-kubernetes-manifests]: /etc/kubernetes/manifests is not empty
[ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists
[ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists
[ERROR Port-10250]: Port 10250 is in use

inthat case
rm -rf /etc/kubernetes/manifests i
rm -rf /etc/kubernetes/pki/ca.crt
rm -rf /etc/kubernetes/kubelet.conf

Port 10250 is in use

for this case #netstat -lnp | grep 10250
it attchend to one LISTEN
kill <LISTEN which is assigned to 10250>

then use
#setenforce 0
#swapoff -a
then use #kubeadm join