I am configuring a Kubernetes cluster with 2 nodes in CoreOS as described in https://coreos.com/kubernetes/docs/latest/getting-started.html without flannel. Both servers are in the same network. Bu...

I set up Kubernetes on CoreOS on bare metal using the generic install scripts. It's running the current stable release, 1298.6.0, with Kubernetes version 1.5.4. We'd like to have a highly availabl...

Recently, prometheus-operator has been promoted to stable helm chart (https://github.com/helm/charts/tree/master/stable/prometheus-operator). I'd like to understand how to add a custom applicatio...

I'm using CoreOS and SystemD timers to run my reports... I have certain monitoring reports that need to run every 3 hours for the next 12 hours, running on the half hour. That's pretty simple to i...

I'm running docker via CoreOS and AWS's ECS. I had a failing image that got restarted many times, and the containers are still around- they filled my drive partition. Specifically, /var/lib/docker/...

I wonder if there is an alternative to the psql command to test the connection to a postgresql database using bash. I'm setting up a Core OS cluster and have a side service which should perform th...

I am running a kubernetes cluster on coreos. I have a kubernetes replication controller that works fine. It looks like this: id: "redis-controller" kind: "ReplicationController" apiVersion:...

I'm running a react app in a docker container, on a Coreos server. Let's say it's been pulled from dockerhub from https://hub.docker.com/r/myimages/myapp. Now I want to check periodically if the d...

I tried kubectl exec on a k8s 1.6.4 RBAC-enabled cluster and the error returned was: error: unable to upgrade connection: Unauthorized. docker exec on the same container succeeds. Otherwise, kubect...

I have some containers which all of them have the always restart value in the docker-compose file like this: version: "3.7" services: container: image: ghost:latest container_name: so...

I am running a container on a VM. My container is writing logs by default to /var/lib/docker/containers/CONTAINER_ID/CONTAINER_ID-json.log file until the disk is full. Currently, I have to delete...

I'm starting to use CoreOS (on AWS ECS). After having it launch my first container, I see this in journalctl: Could not generate persistent MAC address for vethXXXX: No such file or directory He...

I have built a 4 node kubernetes cluster running multi-container pods all running on CoreOS. The images come from public and private repositories. Right now I have to log into each node and manuall...

I'm trying to create a one node etcd cluster on AWS using coreos cloud-config. I have created a Route53 recordset with value etcd.uday.com which has a alias to the ELB which points to the ec2 insta...

I need to delete some rules with same comment. For example I have rules with comment = "test it", so i can get list of them like this: sudo iptables -t nat -L | grep 'test it' But how can i del...

I am new to kubernetes. I have an issue in the pods. When I run the command kubectl get pods Result: NAME READY STATUS RESTARTS AGE mysql-apim-db-1viwg 1/1 Running 1 20h mysql-govdb-qioee 1/1 ...

I have a list of PID's and I need to get their docker container name. Going the other direction is easy ... get PID of docker container by image name: $ docker inspect --format '{{.State.Pid}}' {S...

I'm looking to deploy high availability Redis on a coreOS cluster, and I need a Redis Sentinel docker image (i.e. Dockerfile) that works. I've gathered enough information/expertise to create one (I...

I'm currently learning Docker, and have made a nice and simple Docker Compose setup. 3 containers, all with their own Dockerfile setup. How could I go about converting this to work on CoreOS so I c...

I cannot figure out from documentation and source code how to define size of the root device. You can specify N additional block devices using BlockDeviceMappings section where you can declare the...

How do I cleanly reboot my coreOS after the following issue shows up? core@node2 ~ $ sudo reboot Failed to talk to init daemon core@node2 ~ $ sudo shutdown -r now Failed to talk to init daemon. co...

With centos in a docker container, I just type 'docker attach container ID' and it takes me to the shell prompt, where i can install and configure nginx. This one is easier: docker.com dockerfile...

I would like to create a kubernetes pod that contains 2 containers, both with different images, so I can start both containers together. Currently I have tried the following configuration: { "id...

I am refactoring a couple of node.js services. All of them used to start with forever on virtual servers, if the process crashed they just relaunch. Now, moving to containerised and state-less app...

I'm using Kubernetes v1.8.14 on custom built CoreOS cluster: $ kubectl version --short Client Version: v1.10.5 Server Version: v1.8.14+coreos.0 When trying to create the following ClusterRole: ...