Get logs inside a Unikernel instance

[robertob]

I have two instances of a my Unikernel image. This image is built on top of a Cloudious JDK8 image and run a small simulator written in Java. 

The instances see each other through a different network and bridge configuration. So we use "-n bridge" and set the --e parameter with 10.0.0.x IPs with name server and gateway. 

Now we need to get the logs written by the Java application inside the running image. 

How to do this task?

Regards

r

[Waldek Kozaczuk]

Hi,

One way is to use REST api to get file from OSv. Just add httpserver-api module to your image.

Waldek

[roberto battistoni]

The problem is that the two instances run on a separate network and I do not understand how to reach them from the outside...

The startup command is this:

first instance: capstan run -n "bridge" -e "--ip=eth0,10.0.0.2,255.255.255.0 --defaultgw=10.0.0.1 --nameserver=10.0.0.1 /java.so -jar /my.jar"

second instance: capstan run -n "bridge" -e "--ip=eth0,10.0.0.3,255.255.255.0 --defaultgw=10.0.0.1 --nameserver=10.0.0.1 /java.so -jar /my.jar"  

And the Capstanfile is this:

base: cloudius/osv-openjdk8

cmdline: /java.so

files:

  /my.jar: my.jar

The problem is that I cannot reach the IP 10.0.0.2 o 10.0.0.3 from the outside.

regards

r

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[robertob]

Any advice? 

regards

Il giorno venerdì 8 marzo 2019 14:53:45 UTC+1, robertob ha scritto:

The problem is that the two instances run on a separate network and I do not understand how to reach them from the outside...

The startup command is this:

first instance: capstan run -n "bridge" -e "--ip=eth0,10.0.0.2,255.255.255.0 --defaultgw=10.0.0.1 --nameserver=10.0.0.1 /java.so -jar /my.jar"

second instance: capstan run -n "bridge" -e "--ip=eth0,10.0.0.3,255.255.255.0 --defaultgw=10.0.0.1 --nameserver=10.0.0.1 /java.so -jar /my.jar"  

And the Capstanfile is this:

base: cloudius/osv-openjdk8

cmdline: /java.so

files:

  /my.jar: my.jar

The problem is that I cannot reach the IP 10.0.0.2 o 10.0.0.3 from the outside.

regards

r

[Waldek Kozaczuk]

Adding -f "10022:22" should expose the port to the host. Which hypervisor are you running it on - QEMU/KVM, VirtualBox, VMWare, Xen?

Waldek

[roberto battistoni]

I use the QEMU hypervisor. 

The problem is that in the Capstanfile the "base:" is "cloudius/osv-openjdk8" and I do not understand how add another base image like "httpserver" or "cloudius/osv" to activate the REST services. 

Any suggestion?

regards

r

[Waldek Kozaczuk]

Hi,

You can easily do this with newest mikelangelo capstan using compose-family-of-commands (https://github.com/mikelangelo-project/capstan/blob/master/Documentation/generated/CLI.md#working-with-application-packages - ala docker compose). 

My sense is that your are using old capstan with Capstan file. Which version of OSv is displayed when running it? As I mentioned in my other email I would strongly suggest using new capstan. Also new package mode vs Capstanfile.  

Lastly see this docket project for many examples of apps built using new capstan - https://github.com/wkozaczuk/docker_osv_runner. Look for require section in package.yaml in this example - https://github.com/wkozaczuk/docker_osv_runner/blob/7eb359addb9cd1ff5af18e2d0ac9c4c4fc9d2a29/apps/ffmpeg/meta/package.yaml. 

Waldek

PS. Some other docs that may help you:

- https://www.mikelangelo-project.eu/technology/unikernel-application-management-users-manual/

- https://github.com/mikelangelo-project/capstan/blob/master/Documentation/ApplicationManagement.md

- https://github.com/cloudius-systems/osv/wiki/Build-and-run-apps-on-OSv-using-Capstan

[Roberto Battistoni]

Hi,

On 13/03/2019 17:06, Waldek Kozaczuk wrote:

Hi,

You can easily do this with newest mikelangelo capstan using compose-family-of-commands (https://github.com/mikelangelo-project/capstan/blob/master/Documentation/generated/CLI.md#working-with-application-packages - ala docker compose).

I suppose the same thing, but for my research I needed only the log inside the images and I didn't want to upgrade everything for a residual part.

My sense is that your are using old capstan with Capstan file. Which version of OSv is displayed when running it?

0.24

As I mentioned in my other email I would strongly suggest using new capstan. Also new package mode vs Capstanfile.  

Lastly see this docket project for many examples of apps built using new capstan - https://github.com/wkozaczuk/docker_osv_runner. Look for require section in package.yaml in this example - https://github.com/wkozaczuk/docker_osv_runner/blob/7eb359addb9cd1ff5af18e2d0ac9c4c4fc9d2a29/apps/ffmpeg/meta/package.yaml. 

thanks you so much Waldek you helped me a lot

r.