Unable to ping one service to another service in Kubernetes cluster?
I have created a local ubuntu Kubernetes cluster, having 1 master and 2 slave nodes.
I deployed 2 applications in 2 pods and created service for both of the pods, it's working fine.
I entered inside pod by typing this command ,
$ kubectl exec -it firstpod /bin/bash
# apt-get update
Unable to make update and I'm getting an error:
Err http://security.debian.org jessie/updates InRelease
Err http://deb.debian.org jessie InRelease
Err http://deb.debian.org jessie-updates InRelease
Err http://security.debian.org jessie/updates Release.gpg Temporary failure resolving 'security.debian.org' Err http://deb.debian.org jessie-backports InRelease
Err http://deb.debian.org jessie Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-updates Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-backports Release.gpg Temporary failure resolving 'deb.debian.org' Reading package lists... Done W: Failed to fetch http://deb.debian.org/debian/dists/jessie/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/Release.gpg Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.
I'm trying to ping my second pod service:
# ping secondservice (This is the service name of secondpod)
PING secondservice.default.svc.cluster.local (10.100.190.196): 56 data bytes
unable to ping.
How can I ping/call the second service from the first node?
kubernetes kubernetes-service edited Nov 23 '18 at 8:45
halfer
14.7k759116
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
add a comment |
I have created a local ubuntu Kubernetes cluster, having 1 master and 2 slave nodes.
I deployed 2 applications in 2 pods and created service for both of the pods, it's working fine.
I entered inside pod by typing this command ,
$ kubectl exec -it firstpod /bin/bash
# apt-get update
Unable to make update and I'm getting an error:
Err http://security.debian.org jessie/updates InRelease
Err http://deb.debian.org jessie InRelease
Err http://deb.debian.org jessie-updates InRelease
Err http://security.debian.org jessie/updates Release.gpg Temporary failure resolving 'security.debian.org' Err http://deb.debian.org jessie-backports InRelease
Err http://deb.debian.org jessie Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-updates Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-backports Release.gpg Temporary failure resolving 'deb.debian.org' Reading package lists... Done W: Failed to fetch http://deb.debian.org/debian/dists/jessie/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/Release.gpg Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.
I'm trying to ping my second pod service:
# ping secondservice (This is the service name of secondpod)
PING secondservice.default.svc.cluster.local (10.100.190.196): 56 data bytes
unable to ping.
How can I ping/call the second service from the first node?
kubernetes kubernetes-service edited Nov 23 '18 at 8:45
halfer
14.7k759116
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
2
Did you install pod network (calico/flannel.. etc) in your cluster? Also can you please check thekube-proxypod's log?
– hoque
Nov 16 '18 at 6:23
Looks like you don't have any network...
– Rico
Nov 16 '18 at 6:38
ys I have install flannel network ,and all the system pods are working fine .This is the logs
– Chintamani
Nov 16 '18 at 9:41
add a comment |
I have created a local ubuntu Kubernetes cluster, having 1 master and 2 slave nodes.
I deployed 2 applications in 2 pods and created service for both of the pods, it's working fine.
I entered inside pod by typing this command ,
$ kubectl exec -it firstpod /bin/bash
# apt-get update
Unable to make update and I'm getting an error:
Err http://security.debian.org jessie/updates InRelease
Err http://deb.debian.org jessie InRelease
Err http://deb.debian.org jessie-updates InRelease
Err http://security.debian.org jessie/updates Release.gpg Temporary failure resolving 'security.debian.org' Err http://deb.debian.org jessie-backports InRelease
Err http://deb.debian.org jessie Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-updates Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-backports Release.gpg Temporary failure resolving 'deb.debian.org' Reading package lists... Done W: Failed to fetch http://deb.debian.org/debian/dists/jessie/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/Release.gpg Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.
I'm trying to ping my second pod service:
# ping secondservice (This is the service name of secondpod)
PING secondservice.default.svc.cluster.local (10.100.190.196): 56 data bytes
unable to ping.
How can I ping/call the second service from the first node?
kubernetes kubernetes-service edited Nov 23 '18 at 8:45
halfer
14.7k759116
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
I have created a local ubuntu Kubernetes cluster, having 1 master and 2 slave nodes.
I deployed 2 applications in 2 pods and created service for both of the pods, it's working fine.
I entered inside pod by typing this command ,
$ kubectl exec -it firstpod /bin/bash
# apt-get update
Unable to make update and I'm getting an error:
Err http://security.debian.org jessie/updates InRelease
Err http://deb.debian.org jessie InRelease
Err http://deb.debian.org jessie-updates InRelease
Err http://security.debian.org jessie/updates Release.gpg Temporary failure resolving 'security.debian.org' Err http://deb.debian.org jessie-backports InRelease
Err http://deb.debian.org jessie Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-updates Release.gpg Temporary failure resolving 'deb.debian.org' Err http://deb.debian.org jessie-backports Release.gpg Temporary failure resolving 'deb.debian.org' Reading package lists... Done W: Failed to fetch http://deb.debian.org/debian/dists/jessie/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/InRelease
W: Failed to fetch http://security.debian.org/dists/jessie/updates/Release.gpg Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-backports/Release.gpg Temporary failure resolving 'deb.debian.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.
I'm trying to ping my second pod service:
# ping secondservice (This is the service name of secondpod)
PING secondservice.default.svc.cluster.local (10.100.190.196): 56 data bytes
unable to ping.
How can I ping/call the second service from the first node?
kubernetes kubernetes-service kubernetes kubernetes-service edited Nov 23 '18 at 8:45
halfer
14.7k759116
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
edited Nov 23 '18 at 8:45
halfer
14.7k759116
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
edited Nov 23 '18 at 8:45
halfer
14.7k759116
edited Nov 23 '18 at 8:45
halfer
14.7k759116
edited Nov 23 '18 at 8:45
halfer
14.7k759116
14.7k759116
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
asked Nov 16 '18 at 5:16
ChintamaniChintamani
2682728
2682728
2
Did you install pod network (calico/flannel.. etc) in your cluster? Also can you please check thekube-proxypod's log?
– hoque
Nov 16 '18 at 6:23
Looks like you don't have any network...
– Rico
Nov 16 '18 at 6:38
ys I have install flannel network ,and all the system pods are working fine .This is the logs
– Chintamani
Nov 16 '18 at 9:41
add a comment |
2
Did you install pod network (calico/flannel.. etc) in your cluster? Also can you please check thekube-proxypod's log?
– hoque
Nov 16 '18 at 6:23
Looks like you don't have any network...
– Rico
Nov 16 '18 at 6:38
ys I have install flannel network ,and all the system pods are working fine .This is the logs
– Chintamani
Nov 16 '18 at 9:41
2
2
Did you install pod network (calico/flannel.. etc) in your cluster? Also can you please check the
kube-proxy pod's log?– hoque
Nov 16 '18 at 6:23
Did you install pod network (calico/flannel.. etc) in your cluster? Also can you please check the
kube-proxy pod's log?– hoque
Nov 16 '18 at 6:23
Looks like you don't have any network...
– Rico
Nov 16 '18 at 6:38
Looks like you don't have any network...
– Rico
Nov 16 '18 at 6:38
ys I have install flannel network ,and all the system pods are working fine .This is the logs
– Chintamani
Nov 16 '18 at 9:41
ys I have install flannel network ,and all the system pods are working fine .This is the logs
– Chintamani
Nov 16 '18 at 9:41
add a comment |
1 Answer
1
active
oldest
votes
There are two (unrelated) questions I see there. I'm going to focus on the second one since the first is unclear to me (what is the ask?).
So, you wonder why the following doesn't work:
# ping secondservice
This is not a bug or unexpected (actually, I wrote about it here). In short: the FQDN secondservice.default.svc.cluster.local gets resolved via the DNS plugin to a virtual IP (VIP), the very essence of this VIP is that it is virtual, that is, it's not attached to a network interface, it's just a bunch of iptables rules. Hence, the ICMP-based ping has nothing to work against, since it's not a 'real' IP. You can curl the service, though. Assuming the service runs on port 9876, the following should work:
# curl secondservice:9876
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
Hi Michael ,there are 2 pods first and second and service firstservice and secondservice repectively .now I am in firstpod by typing command : kubectl exec -it firstpod /bin/bash .From here I am typing your curl command curl secondservice:3011 .but the output showing nothing .is this correct or is there other way .
– Chintamani
Nov 16 '18 at 10:12
Since I don't know your app I don't know what the expected output is. What do you mean with "showing nothing"? Do acurl -vand update your question with the output, please.
– Michael Hausenblas
Nov 16 '18 at 12:26
1
able to get the output .thank you .
– Chintamani
Nov 16 '18 at 13:15
add a comment |
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There are two (unrelated) questions I see there. I'm going to focus on the second one since the first is unclear to me (what is the ask?).
So, you wonder why the following doesn't work:
# ping secondservice
This is not a bug or unexpected (actually, I wrote about it here). In short: the FQDN secondservice.default.svc.cluster.local gets resolved via the DNS plugin to a virtual IP (VIP), the very essence of this VIP is that it is virtual, that is, it's not attached to a network interface, it's just a bunch of iptables rules. Hence, the ICMP-based ping has nothing to work against, since it's not a 'real' IP. You can curl the service, though. Assuming the service runs on port 9876, the following should work:
# curl secondservice:9876
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
Hi Michael ,there are 2 pods first and second and service firstservice and secondservice repectively .now I am in firstpod by typing command : kubectl exec -it firstpod /bin/bash .From here I am typing your curl command curl secondservice:3011 .but the output showing nothing .is this correct or is there other way .
– Chintamani
Nov 16 '18 at 10:12
Since I don't know your app I don't know what the expected output is. What do you mean with "showing nothing"? Do acurl -vand update your question with the output, please.
– Michael Hausenblas
Nov 16 '18 at 12:26
1
able to get the output .thank you .
– Chintamani
Nov 16 '18 at 13:15
add a comment |
There are two (unrelated) questions I see there. I'm going to focus on the second one since the first is unclear to me (what is the ask?).
So, you wonder why the following doesn't work:
# ping secondservice
This is not a bug or unexpected (actually, I wrote about it here). In short: the FQDN secondservice.default.svc.cluster.local gets resolved via the DNS plugin to a virtual IP (VIP), the very essence of this VIP is that it is virtual, that is, it's not attached to a network interface, it's just a bunch of iptables rules. Hence, the ICMP-based ping has nothing to work against, since it's not a 'real' IP. You can curl the service, though. Assuming the service runs on port 9876, the following should work:
# curl secondservice:9876
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
Hi Michael ,there are 2 pods first and second and service firstservice and secondservice repectively .now I am in firstpod by typing command : kubectl exec -it firstpod /bin/bash .From here I am typing your curl command curl secondservice:3011 .but the output showing nothing .is this correct or is there other way .
– Chintamani
Nov 16 '18 at 10:12
Since I don't know your app I don't know what the expected output is. What do you mean with "showing nothing"? Do acurl -vand update your question with the output, please.
– Michael Hausenblas
Nov 16 '18 at 12:26
1
able to get the output .thank you .
– Chintamani
Nov 16 '18 at 13:15
add a comment |
There are two (unrelated) questions I see there. I'm going to focus on the second one since the first is unclear to me (what is the ask?).
So, you wonder why the following doesn't work:
# ping secondservice
This is not a bug or unexpected (actually, I wrote about it here). In short: the FQDN secondservice.default.svc.cluster.local gets resolved via the DNS plugin to a virtual IP (VIP), the very essence of this VIP is that it is virtual, that is, it's not attached to a network interface, it's just a bunch of iptables rules. Hence, the ICMP-based ping has nothing to work against, since it's not a 'real' IP. You can curl the service, though. Assuming the service runs on port 9876, the following should work:
# curl secondservice:9876
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
There are two (unrelated) questions I see there. I'm going to focus on the second one since the first is unclear to me (what is the ask?).
So, you wonder why the following doesn't work:
# ping secondservice
This is not a bug or unexpected (actually, I wrote about it here). In short: the FQDN secondservice.default.svc.cluster.local gets resolved via the DNS plugin to a virtual IP (VIP), the very essence of this VIP is that it is virtual, that is, it's not attached to a network interface, it's just a bunch of iptables rules. Hence, the ICMP-based ping has nothing to work against, since it's not a 'real' IP. You can curl the service, though. Assuming the service runs on port 9876, the following should work:
# curl secondservice:9876
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
answered Nov 16 '18 at 9:43
Michael HausenblasMichael Hausenblas
6,44622243
6,44622243
Hi Michael ,there are 2 pods first and second and service firstservice and secondservice repectively .now I am in firstpod by typing command : kubectl exec -it firstpod /bin/bash .From here I am typing your curl command curl secondservice:3011 .but the output showing nothing .is this correct or is there other way .
– Chintamani
Nov 16 '18 at 10:12
Since I don't know your app I don't know what the expected output is. What do you mean with "showing nothing"? Do acurl -vand update your question with the output, please.
– Michael Hausenblas
Nov 16 '18 at 12:26
1
able to get the output .thank you .
– Chintamani
Nov 16 '18 at 13:15
add a comment |
Hi Michael ,there are 2 pods first and second and service firstservice and secondservice repectively .now I am in firstpod by typing command : kubectl exec -it firstpod /bin/bash .From here I am typing your curl command curl secondservice:3011 .but the output showing nothing .is this correct or is there other way .
– Chintamani
Nov 16 '18 at 10:12
Since I don't know your app I don't know what the expected output is. What do you mean with "showing nothing"? Do acurl -vand update your question with the output, please.
– Michael Hausenblas
Nov 16 '18 at 12:26
1
able to get the output .thank you .
– Chintamani
Nov 16 '18 at 13:15
Hi Michael ,there are 2 pods first and second and service firstservice and secondservice repectively .now I am in firstpod by typing command : kubectl exec -it firstpod /bin/bash .From here I am typing your curl command curl secondservice:3011 .but the output showing nothing .is this correct or is there other way .
– Chintamani
Nov 16 '18 at 10:12
Hi Michael ,there are 2 pods first and second and service firstservice and secondservice repectively .now I am in firstpod by typing command : kubectl exec -it firstpod /bin/bash .From here I am typing your curl command curl secondservice:3011 .but the output showing nothing .is this correct or is there other way .
– Chintamani
Nov 16 '18 at 10:12
Since I don't know your app I don't know what the expected output is. What do you mean with "showing nothing"? Do a
curl -v and update your question with the output, please.– Michael Hausenblas
Nov 16 '18 at 12:26
Since I don't know your app I don't know what the expected output is. What do you mean with "showing nothing"? Do a
curl -v and update your question with the output, please.– Michael Hausenblas
Nov 16 '18 at 12:26
1
1
able to get the output .thank you .
– Chintamani
Nov 16 '18 at 13:15
able to get the output .thank you .
– Chintamani
Nov 16 '18 at 13:15
add a comment |
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2
Did you install pod network (calico/flannel.. etc) in your cluster? Also can you please check the
kube-proxypod's log?– hoque
Nov 16 '18 at 6:23
Looks like you don't have any network...
– Rico
Nov 16 '18 at 6:38
ys I have install flannel network ,and all the system pods are working fine .This is the logs
– Chintamani
Nov 16 '18 at 9:41