exec format error

error: exec format error

you may get this error while running a pod using a docker image.

as shown below —

k -n middleware logs -f tomcat-87fbdc964-gjtkl
exec /usr/local/tomcat/bin/catalina.sh: exec format error

this pod from a deployment has a docker image which needs to be inspected.

check the architecture of the docker image:

docker inspect --format='{{.Architecture}}' 118***650135.dkr.ecr.eu-west-1.amazonaws.com/tomcat-10.1-jdk-21:v1
arm64

check the architecture of the nodes:

kubectl get nodes -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.nodeInfo.architecture}{"\n"}{end}'

ip-10-5-12-209.eu-west-1.compute.internal       amd64
ip-10-5-13-52.eu-west-1.compute.internal        amd64
ip-10-5-14-208.eu-west-1.compute.internal       amd64
ip-10-5-14-63.eu-west-1.compute.internal        amd64

So the docker image with architecture arm64 havingn problem to live blissfully in node with architecture amd64.

a simple fix:

make changes in docker desktop

change the above config to the one shown below

export DOCKER_BUILDKIT=1

% docker buildx create --name mybuilder --use

mybuilder

% docker buildx inspect --bootstrap

[+] Building 8.4s (0/1)                                                                                                                 
 => [internal] booting buildkit                                                                                                    8.4s
 => => pulling image moby/buildkit:buildx-stable-1                                                                                 8.4s

....
GC Policy rule#1:
 All:           false
 Keep Duration: 1440h0m0s
 Keep Bytes:    5.588GiB
GC Policy rule#2:
 All:        false
 Keep Bytes: 5.588GiB
GC Policy rule#3:
 All:        true
 Keep Bytes: 5.588GiB

% docker buildx build --platform linux/amd64,linux/arm64 -t *********.dkr.ecr.eu-west-1.amazonaws.com/tomcat-10.1-jdk-21:v2 --push .