Shared volume of 1 container into another container in Kubernates

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I am stuck on a scenario where I have to get the log folder of container 1 into 2nd container. I have found a solution in which we will create a emptyDir directory.

spec:

  containers:

  - name: app

    image: app-image

    imagePullPolicy: Always

    ports:

    - containerPort: 8080

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

But in my situation I want to share /usr/var/log/tomcat/ of 1st container into /var/log/message. This is because splunkUF image will monitor /var/log/app/. so I want to share the log folder of different apps, be it /var/log/app/tomcat or /var/log/messages but at one same location with splunk container /var/log/app/.

I can run copy command to get the log 1 time but how to get the logs continuously?

asked Nov 22 '18 at 7:51

gamechanger17

1831112

Which version of kubernetes are you using?

– Urosh T.
Nov 22 '18 at 8:39

I am using latest but does it make any difference? So that I document the version for my reference

– gamechanger17
Nov 22 '18 at 9:36

emptyDir is not good because it will be deleted once the pod is re-assigned. Also, are you using Volumes or PersistentVolumes? I asked for a version because there are some things in beta that might help you but it ain't easy. Example: kubernetes.io/docs/concepts/storage/volumes/#mount-propagation

– Urosh T.
Nov 22 '18 at 10:05

@UroshT. I am not using beta. So what could be my best options apart for the one present in beta?

– gamechanger17
Nov 22 '18 at 10:08

@gamechanger17, Have you considered to set remote logging via rsyslog and catch logs in /var/log/messages like described here? There is also solution for Tomcat.

– mk_sta
Nov 22 '18 at 11:36

add a comment |

I am stuck on a scenario where I have to get the log folder of container 1 into 2nd container. I have found a solution in which we will create a emptyDir directory.

spec:

  containers:

  - name: app

    image: app-image

    imagePullPolicy: Always

    ports:

    - containerPort: 8080

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

I can run copy command to get the log 1 time but how to get the logs continuously?

asked Nov 22 '18 at 7:51

gamechanger17

1831112

Which version of kubernetes are you using?

– Urosh T.
Nov 22 '18 at 8:39

I am using latest but does it make any difference? So that I document the version for my reference

– gamechanger17
Nov 22 '18 at 9:36

emptyDir is not good because it will be deleted once the pod is re-assigned. Also, are you using Volumes or PersistentVolumes? I asked for a version because there are some things in beta that might help you but it ain't easy. Example: kubernetes.io/docs/concepts/storage/volumes/#mount-propagation

– Urosh T.
Nov 22 '18 at 10:05

@UroshT. I am not using beta. So what could be my best options apart for the one present in beta?

– gamechanger17
Nov 22 '18 at 10:08

@gamechanger17, Have you considered to set remote logging via rsyslog and catch logs in /var/log/messages like described here? There is also solution for Tomcat.

– mk_sta
Nov 22 '18 at 11:36

add a comment |

I am stuck on a scenario where I have to get the log folder of container 1 into 2nd container. I have found a solution in which we will create a emptyDir directory.

spec:

  containers:

  - name: app

    image: app-image

    imagePullPolicy: Always

    ports:

    - containerPort: 8080

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

I can run copy command to get the log 1 time but how to get the logs continuously?

asked Nov 22 '18 at 7:51

gamechanger17

1831112

I am stuck on a scenario where I have to get the log folder of container 1 into 2nd container. I have found a solution in which we will create a emptyDir directory.

spec:

  containers:

  - name: app

    image: app-image

    imagePullPolicy: Always

    ports:

    - containerPort: 8080

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

I can run copy command to get the log 1 time but how to get the logs continuously?

kubernetes splunk

asked Nov 22 '18 at 7:51

gamechanger17

1831112

asked Nov 22 '18 at 7:51

gamechanger17

1831112

asked Nov 22 '18 at 7:51

gamechanger17

1831112

asked Nov 22 '18 at 7:51

gamechanger17

1831112

asked Nov 22 '18 at 7:51

gamechanger17

1831112

Which version of kubernetes are you using?

– Urosh T.
Nov 22 '18 at 8:39

I am using latest but does it make any difference? So that I document the version for my reference

– gamechanger17
Nov 22 '18 at 9:36

emptyDir is not good because it will be deleted once the pod is re-assigned. Also, are you using Volumes or PersistentVolumes? I asked for a version because there are some things in beta that might help you but it ain't easy. Example: kubernetes.io/docs/concepts/storage/volumes/#mount-propagation

– Urosh T.
Nov 22 '18 at 10:05

@UroshT. I am not using beta. So what could be my best options apart for the one present in beta?

– gamechanger17
Nov 22 '18 at 10:08

@gamechanger17, Have you considered to set remote logging via rsyslog and catch logs in /var/log/messages like described here? There is also solution for Tomcat.

– mk_sta
Nov 22 '18 at 11:36

add a comment |

Which version of kubernetes are you using?

– Urosh T.
Nov 22 '18 at 8:39

I am using latest but does it make any difference? So that I document the version for my reference

– gamechanger17
Nov 22 '18 at 9:36

emptyDir is not good because it will be deleted once the pod is re-assigned. Also, are you using Volumes or PersistentVolumes? I asked for a version because there are some things in beta that might help you but it ain't easy. Example: kubernetes.io/docs/concepts/storage/volumes/#mount-propagation

– Urosh T.
Nov 22 '18 at 10:05

@UroshT. I am not using beta. So what could be my best options apart for the one present in beta?

– gamechanger17
Nov 22 '18 at 10:08

@gamechanger17, Have you considered to set remote logging via rsyslog and catch logs in /var/log/messages like described here? There is also solution for Tomcat.

– mk_sta
Nov 22 '18 at 11:36

Which version of kubernetes are you using?

– Urosh T.
Nov 22 '18 at 8:39

I am using latest but does it make any difference? So that I document the version for my reference

– gamechanger17
Nov 22 '18 at 9:36

emptyDir is not good because it will be deleted once the pod is re-assigned. Also, are you using Volumes or PersistentVolumes? I asked for a version because there are some things in beta that might help you but it ain't easy. Example: kubernetes.io/docs/concepts/storage/volumes/#mount-propagation

– Urosh T.
Nov 22 '18 at 10:05

@UroshT. I am not using beta. So what could be my best options apart for the one present in beta?

– gamechanger17
Nov 22 '18 at 10:08

@gamechanger17, Have you considered to set remote logging via rsyslog and catch logs in /var/log/messages like described here? There is also solution for Tomcat.

– mk_sta
Nov 22 '18 at 11:36

add a comment |

2 Answers
2

active

oldest

votes

I don't see an issue here.
you can mount the same volume at a different location in each container.

According to your description this should be something like this:

spec:

  containers:

  - name: app

    image: app-image

    ...

    volumeMounts:

    - name: logs

      mountPath: /usr/var/log/tomcat/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

edited Nov 22 '18 at 18:51

Clorichel

8451517

answered Nov 22 '18 at 12:19

antweiss

1,929187

Yes that is the issue. but I don't see the logs in /var/log/app/ location if I go inside the uf container.

– gamechanger17
Nov 22 '18 at 12:27

And you do see them in /usr/var/log/tomcat/ in the tomcat one?

– antweiss
Nov 22 '18 at 12:57

Now I can see the logs on the shared volume but Splunkuf is not forwarding the logs to the server. I have created a new thread: stackoverflow.com/questions/53669208/…

– gamechanger17
Dec 10 '18 at 6:24

add a comment |

If you are using PersistentVolumeClaim or PersistentVolume, I got bad news because the access modes are pretty limited. The one you would want is ReadWriteMany but it has a really limited support ATM. See more info here.

You could do with this however it has limitations of having to share a node host which not might be a desirable behaviour. I believe that something that would best suit your case would be this.

answered Nov 22 '18 at 10:21

Urosh T.

77821420

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

I don't see an issue here.
you can mount the same volume at a different location in each container.

According to your description this should be something like this:

spec:

  containers:

  - name: app

    image: app-image

    ...

    volumeMounts:

    - name: logs

      mountPath: /usr/var/log/tomcat/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

edited Nov 22 '18 at 18:51

Clorichel

8451517

answered Nov 22 '18 at 12:19

antweiss

1,929187

Yes that is the issue. but I don't see the logs in /var/log/app/ location if I go inside the uf container.

– gamechanger17
Nov 22 '18 at 12:27

And you do see them in /usr/var/log/tomcat/ in the tomcat one?

– antweiss
Nov 22 '18 at 12:57

Now I can see the logs on the shared volume but Splunkuf is not forwarding the logs to the server. I have created a new thread: stackoverflow.com/questions/53669208/…

– gamechanger17
Dec 10 '18 at 6:24

add a comment |

I don't see an issue here.
you can mount the same volume at a different location in each container.

According to your description this should be something like this:

spec:

  containers:

  - name: app

    image: app-image

    ...

    volumeMounts:

    - name: logs

      mountPath: /usr/var/log/tomcat/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

edited Nov 22 '18 at 18:51

Clorichel

8451517

answered Nov 22 '18 at 12:19

antweiss

1,929187

Yes that is the issue. but I don't see the logs in /var/log/app/ location if I go inside the uf container.

– gamechanger17
Nov 22 '18 at 12:27

And you do see them in /usr/var/log/tomcat/ in the tomcat one?

– antweiss
Nov 22 '18 at 12:57

Now I can see the logs on the shared volume but Splunkuf is not forwarding the logs to the server. I have created a new thread: stackoverflow.com/questions/53669208/…

– gamechanger17
Dec 10 '18 at 6:24

add a comment |

I don't see an issue here.
you can mount the same volume at a different location in each container.

According to your description this should be something like this:

spec:

  containers:

  - name: app

    image: app-image

    ...

    volumeMounts:

    - name: logs

      mountPath: /usr/var/log/tomcat/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

edited Nov 22 '18 at 18:51

Clorichel

8451517

answered Nov 22 '18 at 12:19

antweiss

1,929187

I don't see an issue here.
you can mount the same volume at a different location in each container.

According to your description this should be something like this:

spec:

  containers:

  - name: app

    image: app-image

    ...

    volumeMounts:

    - name: logs

      mountPath: /usr/var/log/tomcat/

  - name: uf

    image: splunk/splunkuniversalforwarder

    ...

    volumeMounts:

    - name: logs

      mountPath: /var/log/app/

  volumes:

  - name: logs

    emptyDir: {}

edited Nov 22 '18 at 18:51

Clorichel

8451517

answered Nov 22 '18 at 12:19

antweiss

1,929187

edited Nov 22 '18 at 18:51

Clorichel

8451517

edited Nov 22 '18 at 18:51

Clorichel

8451517

edited Nov 22 '18 at 18:51

Clorichel

8451517

answered Nov 22 '18 at 12:19

antweiss

1,929187

answered Nov 22 '18 at 12:19

antweiss

1,929187

answered Nov 22 '18 at 12:19

antweiss

1,929187

Yes that is the issue. but I don't see the logs in /var/log/app/ location if I go inside the uf container.

– gamechanger17
Nov 22 '18 at 12:27

And you do see them in /usr/var/log/tomcat/ in the tomcat one?

– antweiss
Nov 22 '18 at 12:57

Now I can see the logs on the shared volume but Splunkuf is not forwarding the logs to the server. I have created a new thread: stackoverflow.com/questions/53669208/…

– gamechanger17
Dec 10 '18 at 6:24

add a comment |

Yes that is the issue. but I don't see the logs in /var/log/app/ location if I go inside the uf container.

– gamechanger17
Nov 22 '18 at 12:27

And you do see them in /usr/var/log/tomcat/ in the tomcat one?

– antweiss
Nov 22 '18 at 12:57

Now I can see the logs on the shared volume but Splunkuf is not forwarding the logs to the server. I have created a new thread: stackoverflow.com/questions/53669208/…

– gamechanger17
Dec 10 '18 at 6:24

Yes that is the issue. but I don't see the logs in /var/log/app/ location if I go inside the uf container.

– gamechanger17
Nov 22 '18 at 12:27

And you do see them in /usr/var/log/tomcat/ in the tomcat one?

– antweiss
Nov 22 '18 at 12:57

Now I can see the logs on the shared volume but Splunkuf is not forwarding the logs to the server. I have created a new thread: stackoverflow.com/questions/53669208/…

– gamechanger17
Dec 10 '18 at 6:24

add a comment |

You could do with this however it has limitations of having to share a node host which not might be a desirable behaviour. I believe that something that would best suit your case would be this.

answered Nov 22 '18 at 10:21

Urosh T.

77821420

add a comment |

You could do with this however it has limitations of having to share a node host which not might be a desirable behaviour. I believe that something that would best suit your case would be this.

answered Nov 22 '18 at 10:21

Urosh T.

77821420

add a comment |

You could do with this however it has limitations of having to share a node host which not might be a desirable behaviour. I believe that something that would best suit your case would be this.

answered Nov 22 '18 at 10:21

Urosh T.

77821420

You could do with this however it has limitations of having to share a node host which not might be a desirable behaviour. I believe that something that would best suit your case would be this.

answered Nov 22 '18 at 10:21

Urosh T.

77821420

answered Nov 22 '18 at 10:21

Urosh T.

77821420

answered Nov 22 '18 at 10:21

Urosh T.

77821420

answered Nov 22 '18 at 10:21

Urosh T.

77821420

add a comment |

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