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0

I am trying to set up a kubernetes cluster using kubeadm

I want to fetch the join command (done on the master node) and run it on worker node.

The following approach does not work:

- name: kubernetes.yml --> Get the join command
 shell: kubeadm token create --print-join-command
 register: rv_join_command
 when: inventory_hostname in (groups['masters'] | last)
 become: yes


- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " rv_join_command.stdout "
 run_once: true
 when: inventory_hostname in (groups['masters'] | last)


- name: DEBUG kubernetes.yml --> Print the join command
 debug:
 var: rv_join_command.stdout
 when: inventory_hostname in (groups['masters'] | last)


- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " join_command "
 when: inventory_hostname in groups['nodes']

as it fails with:

'join_command' is undefined

But the approach below also fails:

- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " rv_join_command.stdout "
 when: inventory_hostname in groups['nodes']
 become: yes

The error was: 'dict object' has no attribute 'stdout'

Any suggestions?

ansible

share|improve this question

edited Mar 27 at 17:53

larsks

134k2323 gold badges219219 silver badges221221 bronze badges

asked Mar 27 at 17:28

pkaramolpkaramol

2,78411 gold badge2727 silver badges7171 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you used "-vvv" option to Ansible Playbook and verified that "join_command" variable is indeed set, and as per your expectations?
  
  – Kishan Parekh
  Mar 27 at 18:01
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It's hard to tell without seeing your actual playbook, but I suspect the run_once: true is tripping you up. set_fact sets a fact on the current host; if there are multiple hosts in your play, this fact will only be available on one of them.
  
  – larsks
  Mar 27 at 18:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I removed run_once but I get the same results;
  
  – pkaramol
  Mar 27 at 20:33
  

  
  
  
  

add a comment | 

0

I am trying to set up a kubernetes cluster using kubeadm

I want to fetch the join command (done on the master node) and run it on worker node.

The following approach does not work:

- name: kubernetes.yml --> Get the join command
 shell: kubeadm token create --print-join-command
 register: rv_join_command
 when: inventory_hostname in (groups['masters'] | last)
 become: yes


- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " rv_join_command.stdout "
 run_once: true
 when: inventory_hostname in (groups['masters'] | last)


- name: DEBUG kubernetes.yml --> Print the join command
 debug:
 var: rv_join_command.stdout
 when: inventory_hostname in (groups['masters'] | last)


- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " join_command "
 when: inventory_hostname in groups['nodes']

as it fails with:

'join_command' is undefined

But the approach below also fails:

- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " rv_join_command.stdout "
 when: inventory_hostname in groups['nodes']
 become: yes

The error was: 'dict object' has no attribute 'stdout'

Any suggestions?

ansible

share|improve this question

edited Mar 27 at 17:53

larsks

134k2323 gold badges219219 silver badges221221 bronze badges

asked Mar 27 at 17:28

pkaramolpkaramol

2,78411 gold badge2727 silver badges7171 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you used "-vvv" option to Ansible Playbook and verified that "join_command" variable is indeed set, and as per your expectations?
  
  – Kishan Parekh
  Mar 27 at 18:01
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It's hard to tell without seeing your actual playbook, but I suspect the run_once: true is tripping you up. set_fact sets a fact on the current host; if there are multiple hosts in your play, this fact will only be available on one of them.
  
  – larsks
  Mar 27 at 18:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I removed run_once but I get the same results;
  
  – pkaramol
  Mar 27 at 20:33
  

  
  
  
  

add a comment | 

I am trying to set up a kubernetes cluster using kubeadm

I want to fetch the join command (done on the master node) and run it on worker node.

The following approach does not work:

- name: kubernetes.yml --> Get the join command
 shell: kubeadm token create --print-join-command
 register: rv_join_command
 when: inventory_hostname in (groups['masters'] | last)
 become: yes


- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " rv_join_command.stdout "
 run_once: true
 when: inventory_hostname in (groups['masters'] | last)


- name: DEBUG kubernetes.yml --> Print the join command
 debug:
 var: rv_join_command.stdout
 when: inventory_hostname in (groups['masters'] | last)


- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " join_command "
 when: inventory_hostname in groups['nodes']

as it fails with:

'join_command' is undefined

But the approach below also fails:

- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " rv_join_command.stdout "
 when: inventory_hostname in groups['nodes']
 become: yes

The error was: 'dict object' has no attribute 'stdout'

Any suggestions?

ansible

share|improve this question

edited Mar 27 at 17:53

larsks

134k2323 gold badges219219 silver badges221221 bronze badges

asked Mar 27 at 17:28

pkaramolpkaramol

2,78411 gold badge2727 silver badges7171 bronze badges

- name: kubernetes.yml --> Get the join command
 shell: kubeadm token create --print-join-command
 register: rv_join_command
 when: inventory_hostname in (groups['masters'] | last)
 become: yes


- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " rv_join_command.stdout "
 run_once: true
 when: inventory_hostname in (groups['masters'] | last)


- name: DEBUG kubernetes.yml --> Print the join command
 debug:
 var: rv_join_command.stdout
 when: inventory_hostname in (groups['masters'] | last)


- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " join_command "
 when: inventory_hostname in groups['nodes']

- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " rv_join_command.stdout "
 when: inventory_hostname in groups['nodes']
 become: yes

share|improve this question

edited Mar 27 at 17:53

larsks

134k2323 gold badges219219 silver badges221221 bronze badges

asked Mar 27 at 17:28

pkaramolpkaramol

2,78411 gold badge2727 silver badges7171 bronze badges

share|improve this question

edited Mar 27 at 17:53

larsks

134k2323 gold badges219219 silver badges221221 bronze badges

asked Mar 27 at 17:28

pkaramolpkaramol

2,78411 gold badge2727 silver badges7171 bronze badges

edited Mar 27 at 17:53

larsks

134k2323 gold badges219219 silver badges221221 bronze badges

edited Mar 27 at 17:53

larsks

134k2323 gold badges219219 silver badges221221 bronze badges

asked Mar 27 at 17:28

pkaramolpkaramol

2,78411 gold badge2727 silver badges7171 bronze badges

asked Mar 27 at 17:28

pkaramolpkaramol

2,78411 gold badge2727 silver badges7171 bronze badges

1 Answer
1

active

oldest

votes

0

As pointed out in larsks comment above, you are storing the join_command var only for a single host (groups['masters'] | last) and it is only available there.

Meanwhile, it is possible to access vars from other hosts from anywhere.

You basically have two options:

1. Modify the set_fact to store the var on each node from the result on your master


2. Modify the join command run to use the stored var on master on every node

Option 1

- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " hostvars[groups['masters'] "
 when: inventory_hostname in groups['nodes']
# Now you can use join_command on each node

Option 2

# Leave set_fact as it was and then...
- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " last].join_command "
 when: inventory_hostname in groups['nodes']

share|improve this answer

edited Mar 27 at 19:41

answered Mar 27 at 19:35

ZeitounatorZeitounator

2,43311 gold badge44 silver badges1919 bronze badges

add a comment | 

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0

As pointed out in larsks comment above, you are storing the join_command var only for a single host (groups['masters'] | last) and it is only available there.

Meanwhile, it is possible to access vars from other hosts from anywhere.

You basically have two options:

1. Modify the set_fact to store the var on each node from the result on your master


2. Modify the join command run to use the stored var on master on every node

Option 1

- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " hostvars[groups['masters'] "
 when: inventory_hostname in groups['nodes']
# Now you can use join_command on each node

Option 2

# Leave set_fact as it was and then...
- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " last].join_command "
 when: inventory_hostname in groups['nodes']

share|improve this answer

edited Mar 27 at 19:41

answered Mar 27 at 19:35

ZeitounatorZeitounator

2,43311 gold badge44 silver badges1919 bronze badges

add a comment | 

0

As pointed out in larsks comment above, you are storing the join_command var only for a single host (groups['masters'] | last) and it is only available there.

Meanwhile, it is possible to access vars from other hosts from anywhere.

You basically have two options:

1. Modify the set_fact to store the var on each node from the result on your master


2. Modify the join command run to use the stored var on master on every node

Option 1

- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " hostvars[groups['masters'] "
 when: inventory_hostname in groups['nodes']
# Now you can use join_command on each node

Option 2

# Leave set_fact as it was and then...
- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " last].join_command "
 when: inventory_hostname in groups['nodes']

share|improve this answer

edited Mar 27 at 19:41

answered Mar 27 at 19:35

ZeitounatorZeitounator

2,43311 gold badge44 silver badges1919 bronze badges

add a comment | 

As pointed out in larsks comment above, you are storing the join_command var only for a single host (groups['masters'] | last) and it is only available there.

Meanwhile, it is possible to access vars from other hosts from anywhere.

You basically have two options:

1. Modify the set_fact to store the var on each node from the result on your master


2. Modify the join command run to use the stored var on master on every node

Option 1

- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " hostvars[groups['masters'] "
 when: inventory_hostname in groups['nodes']
# Now you can use join_command on each node

Option 2

# Leave set_fact as it was and then...
- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " last].join_command "
 when: inventory_hostname in groups['nodes']

share|improve this answer

edited Mar 27 at 19:41

answered Mar 27 at 19:35

ZeitounatorZeitounator

2,43311 gold badge44 silver badges1919 bronze badges

- name: kubernetes.yml --> Store the join command
 set_fact:
 join_command: " hostvars[groups['masters'] "
 when: inventory_hostname in groups['nodes']
# Now you can use join_command on each node

# Leave set_fact as it was and then...
- name: kubernetes.yml --> Run the join command on kubernetes nodes
 shell: " last].join_command "
 when: inventory_hostname in groups['nodes']

share|improve this answer

edited Mar 27 at 19:41

answered Mar 27 at 19:35

ZeitounatorZeitounator

2,43311 gold badge44 silver badges1919 bronze badges

answered Mar 27 at 19:35

ZeitounatorZeitounator

2,43311 gold badge44 silver badges1919 bronze badges

answered Mar 27 at 19:35

ZeitounatorZeitounator

2,43311 gold badge44 silver badges1919 bronze badges