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Need to run copy script that will copy some files to mounted path [init-container]

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0

I have tomcat as docker image.
I have 3 xmls/property files to bring up the war in my tomcat
I need to write init container which will

1. have a script [shell or python]


2. create a volume and mount it to the main container


3. copy the property files from my local system to the mounted
   volume.


4. then init-container finishes app container starts after this.

for example:
on my local I have the following:

/work-dir tree
├── bootstrap.properties
├── index.html
├── indexing_configuration.xml
├── repository.xml
└── wrapper.sh

init container should run a script wrapper.sh to copy these

files into the mounted volume on app container
which is /usr/share/jack-configs/

kubernetes

share|improve this question

edited Mar 27 at 11:58

A_Suh

1,53811 silver badge99 bronze badges

asked Mar 27 at 9:30

Tuhin Subhra MandalTuhin Subhra Mandal

6666 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What did you try so far, and where are you stuck exactly?
  
  – Webber
  Mar 27 at 9:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This sounds like an out-of-the-box use for a ConfigMap, and not something you'd try to do with an init container.
  
  – David Maze
  Mar 27 at 11:23
  

  
  
  
  

add a comment | 

0

I have tomcat as docker image.
I have 3 xmls/property files to bring up the war in my tomcat
I need to write init container which will

1. have a script [shell or python]


2. create a volume and mount it to the main container


3. copy the property files from my local system to the mounted
   volume.


4. then init-container finishes app container starts after this.

for example:
on my local I have the following:

/work-dir tree
├── bootstrap.properties
├── index.html
├── indexing_configuration.xml
├── repository.xml
└── wrapper.sh

init container should run a script wrapper.sh to copy these

files into the mounted volume on app container
which is /usr/share/jack-configs/

kubernetes

share|improve this question

edited Mar 27 at 11:58

A_Suh

1,53811 silver badge99 bronze badges

asked Mar 27 at 9:30

Tuhin Subhra MandalTuhin Subhra Mandal

6666 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What did you try so far, and where are you stuck exactly?
  
  – Webber
  Mar 27 at 9:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This sounds like an out-of-the-box use for a ConfigMap, and not something you'd try to do with an init container.
  
  – David Maze
  Mar 27 at 11:23
  

  
  
  
  

add a comment | 

I have tomcat as docker image.
I have 3 xmls/property files to bring up the war in my tomcat
I need to write init container which will

1. have a script [shell or python]


2. create a volume and mount it to the main container


3. copy the property files from my local system to the mounted
   volume.


4. then init-container finishes app container starts after this.

for example:
on my local I have the following:

/work-dir tree
├── bootstrap.properties
├── index.html
├── indexing_configuration.xml
├── repository.xml
└── wrapper.sh

init container should run a script wrapper.sh to copy these

files into the mounted volume on app container
which is /usr/share/jack-configs/

kubernetes

share|improve this question

edited Mar 27 at 11:58

A_Suh

1,53811 silver badge99 bronze badges

asked Mar 27 at 9:30

Tuhin Subhra MandalTuhin Subhra Mandal

6666 bronze badges

/work-dir tree
├── bootstrap.properties
├── index.html
├── indexing_configuration.xml
├── repository.xml
└── wrapper.sh

kubernetes

kubernetes

share|improve this question

edited Mar 27 at 11:58

A_Suh

1,53811 silver badge99 bronze badges

asked Mar 27 at 9:30

Tuhin Subhra MandalTuhin Subhra Mandal

6666 bronze badges

share|improve this question

edited Mar 27 at 11:58

A_Suh

1,53811 silver badge99 bronze badges

asked Mar 27 at 9:30

Tuhin Subhra MandalTuhin Subhra Mandal

6666 bronze badges

edited Mar 27 at 11:58

A_Suh

1,53811 silver badge99 bronze badges

edited Mar 27 at 11:58

A_Suh

1,53811 silver badge99 bronze badges

asked Mar 27 at 9:30

Tuhin Subhra MandalTuhin Subhra Mandal

6666 bronze badges

asked Mar 27 at 9:30

Tuhin Subhra MandalTuhin Subhra Mandal

6666 bronze badges

1 Answer
1

active

oldest

votes

1

You have to create a volume and mount on both containers. On Init container you run the script to copy the files to the mounted volume.

Instead of using a local file, I would suggest you use a blob storage to copy you files over, will make it much more simple.

This docs shows how to do what you want.

An example YAML is the following:

apiVersion: v1
kind: Pod
metadata:
 name: init-demo
spec:
 containers:
 - name: nginx
 image: nginx
 ports:
 - containerPort: 80
 volumeMounts:
 - name: workdir
 mountPath: /usr/share/nginx/html
 # These containers are run during pod initialization
 initContainers:
 - name: install
 image: busybox
 command:
 - wget
 - "-O"
 - "/work-dir/index.html"
 - http://kubernetes.io
 volumeMounts:
 - name: workdir
 mountPath: "/work-dir"
 dnsPolicy: Default
 volumes:
 - name: workdir
 emptyDir: 

To accomplish what you want, you have to change the command in the init container to execute your script, this bit I leave you try.

PS: If you really want to copy from a local(node) filesystem, you need to mount another volume to the init container and copy from one volume to another

share|improve this answer

answered Mar 27 at 9:38

Diego MendesDiego Mendes

6,33211 gold badge1919 silver badges2929 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes I am exploring that bit...changing wget to copy command or embedding a script here
  
  – Tuhin Subhra Mandal
  Mar 27 at 10:26
  

  
  
  
  

add a comment | 

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1

You have to create a volume and mount on both containers. On Init container you run the script to copy the files to the mounted volume.

Instead of using a local file, I would suggest you use a blob storage to copy you files over, will make it much more simple.

This docs shows how to do what you want.

An example YAML is the following:

apiVersion: v1
kind: Pod
metadata:
 name: init-demo
spec:
 containers:
 - name: nginx
 image: nginx
 ports:
 - containerPort: 80
 volumeMounts:
 - name: workdir
 mountPath: /usr/share/nginx/html
 # These containers are run during pod initialization
 initContainers:
 - name: install
 image: busybox
 command:
 - wget
 - "-O"
 - "/work-dir/index.html"
 - http://kubernetes.io
 volumeMounts:
 - name: workdir
 mountPath: "/work-dir"
 dnsPolicy: Default
 volumes:
 - name: workdir
 emptyDir: 

To accomplish what you want, you have to change the command in the init container to execute your script, this bit I leave you try.

PS: If you really want to copy from a local(node) filesystem, you need to mount another volume to the init container and copy from one volume to another

share|improve this answer

answered Mar 27 at 9:38

Diego MendesDiego Mendes

6,33211 gold badge1919 silver badges2929 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes I am exploring that bit...changing wget to copy command or embedding a script here
  
  – Tuhin Subhra Mandal
  Mar 27 at 10:26
  

  
  
  
  

add a comment | 

1

You have to create a volume and mount on both containers. On Init container you run the script to copy the files to the mounted volume.

Instead of using a local file, I would suggest you use a blob storage to copy you files over, will make it much more simple.

This docs shows how to do what you want.

An example YAML is the following:

apiVersion: v1
kind: Pod
metadata:
 name: init-demo
spec:
 containers:
 - name: nginx
 image: nginx
 ports:
 - containerPort: 80
 volumeMounts:
 - name: workdir
 mountPath: /usr/share/nginx/html
 # These containers are run during pod initialization
 initContainers:
 - name: install
 image: busybox
 command:
 - wget
 - "-O"
 - "/work-dir/index.html"
 - http://kubernetes.io
 volumeMounts:
 - name: workdir
 mountPath: "/work-dir"
 dnsPolicy: Default
 volumes:
 - name: workdir
 emptyDir: 

To accomplish what you want, you have to change the command in the init container to execute your script, this bit I leave you try.

PS: If you really want to copy from a local(node) filesystem, you need to mount another volume to the init container and copy from one volume to another

share|improve this answer

answered Mar 27 at 9:38

Diego MendesDiego Mendes

6,33211 gold badge1919 silver badges2929 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes I am exploring that bit...changing wget to copy command or embedding a script here
  
  – Tuhin Subhra Mandal
  Mar 27 at 10:26
  

  
  
  
  

add a comment | 

You have to create a volume and mount on both containers. On Init container you run the script to copy the files to the mounted volume.

Instead of using a local file, I would suggest you use a blob storage to copy you files over, will make it much more simple.

This docs shows how to do what you want.

An example YAML is the following:

apiVersion: v1
kind: Pod
metadata:
 name: init-demo
spec:
 containers:
 - name: nginx
 image: nginx
 ports:
 - containerPort: 80
 volumeMounts:
 - name: workdir
 mountPath: /usr/share/nginx/html
 # These containers are run during pod initialization
 initContainers:
 - name: install
 image: busybox
 command:
 - wget
 - "-O"
 - "/work-dir/index.html"
 - http://kubernetes.io
 volumeMounts:
 - name: workdir
 mountPath: "/work-dir"
 dnsPolicy: Default
 volumes:
 - name: workdir
 emptyDir: 

To accomplish what you want, you have to change the command in the init container to execute your script, this bit I leave you try.

PS: If you really want to copy from a local(node) filesystem, you need to mount another volume to the init container and copy from one volume to another

share|improve this answer

answered Mar 27 at 9:38

Diego MendesDiego Mendes

6,33211 gold badge1919 silver badges2929 bronze badges

apiVersion: v1
kind: Pod
metadata:
 name: init-demo
spec:
 containers:
 - name: nginx
 image: nginx
 ports:
 - containerPort: 80
 volumeMounts:
 - name: workdir
 mountPath: /usr/share/nginx/html
 # These containers are run during pod initialization
 initContainers:
 - name: install
 image: busybox
 command:
 - wget
 - "-O"
 - "/work-dir/index.html"
 - http://kubernetes.io
 volumeMounts:
 - name: workdir
 mountPath: "/work-dir"
 dnsPolicy: Default
 volumes:
 - name: workdir
 emptyDir: 

share|improve this answer

answered Mar 27 at 9:38

Diego MendesDiego Mendes

6,33211 gold badge1919 silver badges2929 bronze badges

answered Mar 27 at 9:38

Diego MendesDiego Mendes

6,33211 gold badge1919 silver badges2929 bronze badges

answered Mar 27 at 9:38

Diego MendesDiego Mendes

6,33211 gold badge1919 silver badges2929 bronze badges