Use sideloading from pre-built docker image

karlkfi · Apr 28, 2020 · 2d21f74 · 2d21f74
1 parent 1fb185c
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diff --git a/README.md b/README.md
@@ -70,14 +70,39 @@ Birth Dependency:
 
 ## Install
 
-**TODO**: Alpine & Ubuntu Docker images for multi-stage builds.
-
 Build from source:
 
 ```
 go get github.com/karlkfi/kubexit/cmd/kubexit
 ```
 
+Copy from pre-built Alpine-based container image in a multi-stage build:
+
+```
+FROM karlkfi/kubexit:latest AS kubexit
+
+FROM alpine:3.11
+RUN apk --no-cache add ca-certificates tzdata
+COPY --from=kubexit /bin/kubexit /bin/
+ENTRYPOINT ["kubexit"]
+```
+
+Copy from init container to ephemeral volume:
+
+```
+volumes:
+- name: kubexit
+  emptyDir: {}
+
+initContainers:
+- name: kubexit
+  image: karlkfi/kubexit:latest
+  command: ['cp', '/bin/kubexit', '/kubexit/kubexit']
+  volumeMounts:
+  - mountPath: /kubexit
+    name: kubexit
+```
+
 ## Examples
 
 - [Client Server Job](examples/client-server-job/)

diff --git a/examples/client-server-job/README.md b/examples/client-server-job/README.md
@@ -1,7 +1,7 @@
 # Example: Clinet Server Job
 
 This example has 3 containers:
-- `kubexit` - An init container that builds kubexit and stores it in an ephemeral volume for the other containers to use. Ideally, you would use a pre-built image instead, for faster startup. But this way you can test new source code.
+- `kubexit` - An init container that builds kubexit and stores it in an ephemeral volume for the other containers to use.
 - `client` - An alpine container that installs curl, sleeps until the server is ready (birth dependency), curls the server, and then exits.
 - `server` - An nginx container that sleeps (to exemplify slow startup), and then starts serving traffic. When the client exits, the server will exit (death dependency).
 
@@ -12,8 +12,6 @@ kubectl apply -f examples/client-server-job/job.yaml
 
 POD_NAME="$(kubectl get pod -l app=example-job --no-headers=true -o=custom-columns='DATA:metadata.name')"
 
-kubectl logs "${POD_NAME}" -f -c kubexit 2>&1 | tee examples/client-server-job/kubexit.log
-sleep 5
 kubectl logs "${POD_NAME}" -f -c client 2>&1 | tee examples/client-server-job/client.log
 kubectl logs "${POD_NAME}" -f -c server 2>&1 | tee examples/client-server-job/server.log
 

diff --git a/examples/client-server-job/client.log b/examples/client-server-job/client.log
@@ -19,63 +19,63 @@ Tombstone: /graveyard/client
 Birth Deps: server
 Death Deps: N/A
 Grace Period: 30s
-Pod Name: example-job-tsq2p
+Pod Name: example-job-kflt8
 Namespace: default
 Watching pod updates...
 Event Type: ADDED
 Event Type: MODIFIED
+Pod Watch(example-job-kflt8): done
 All birth deps ready: server
 Exec: /usr/bin/curl -v --fail http://localhost:80/
-Pod Watch(example-job-tsq2p): done
-Creating tombstone: /graveyard/client
-  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
+  % Total    % ReceCreating tombstone: /graveyard/client
+ived % Xferd  Average Speed   Time    Time     Time  Current
                                  Dload  Upload   Total   Spent    Left  Speed
   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying 127.0.0.1:80...
 * TCP_NODELAY set
 * Connected to localhost (127.0.0.1) port 80 (#0)
 > GET / HTTP/1.1
 > Host: localhost
 > User-Agent: curl/7.67.0
+> Accept: */*
+> 
+* Mark bundle as not supporting multiuse
+< HTTP/1.1 200 OK
+< Server: nginx/1.17.10
+< Date: Tue, 28 Apr 2020 10:41:47 GMT
+< Content-Type: text/html
+< Content-Length: 612
+< Last-Modified: Tue, 14 Apr 2020 14:46:22 GMT
+< Connection: keep-alive
+< ETag: "5e95ccbe-264"
+< Accept-Ranges: bytes
+< 
+{ [612 bytes data]
+100   612  100   612    0     0  14571      0 --:--:-- --:--:-- --:--:-- 15300
 <!DOCTYPE html>
+* Connection #0 to host localhost left intact
 <html>
 <head>
 <title>Welcome to nginx!</title>
 <style>
     body {
         width: 35em;
+Exit(0)
+Updating tombstone: /graveyard/client
         margin: 0 auto;
-> Accept: */*
         font-family: Tahoma, Verdana, Arial, sans-serif;
-> 
     }
-* Mark bundle as not supporting multiuse
 </style>
-< HTTP/1.1 200 OK
 </head>
-< Server: nginx/1.17.10
-< Date: Tue, 28 Apr 2020 09:42:39 GMT
 <body>
-< Content-Type: text/html
 <h1>Welcome to nginx!</h1>
-< Content-Length: 612
 <p>If you see this page, the nginx web server is successfully installed and
 working. Further configuration is required.</p>
-< Last-Modified: Tue, 14 Apr 2020 14:46:22 GMT
-< Connection: keep-alive
 
-< ETag: "5e95ccbe-264"
 <p>For online documentation and support please refer to
-< Accept-Ranges: bytes
 <a href="http://nginx.org/">nginx.org</a>.<br/>
-< 
 Commercial support is available at
-{ [612 bytes data]
 <a href="http://nginx.com/">nginx.com</a>.</p>
-100   612  100   612    0     0   199k      0 --:--:-- --:--:-- --:--:--  199k
 
-* Connection #0 to host localhost left intact
 <p><em>Thank you for using nginx.</em></p>
 </body>
 </html>
-Exit(0)
-Updating tombstone: /graveyard/client

diff --git a/examples/client-server-job/job.yaml b/examples/client-server-job/job.yaml
@@ -19,18 +19,8 @@ spec:
 
       initContainers:
       - name: kubexit
-        image: golang:1.14.1-alpine3.11
-        command: ['sh', '-c']
-        args:
-        - |
-          set -o errexit -o nounset -o pipefail
-          apk --no-cache add git
-          mkdir /build
-          cd /build
-          git clone https://github.com/karlkfi/kubexit .
-          git checkout "karl-birth-deps"
-          CGO_ENABLED=0 GOOS=linux go build -o /kubexit/kubexit ./cmd/kubexit
-          echo "kubexit -> /kubexit/kubexit"
+        image: karlkfi/kubexit:latest
+        command: ['cp', '/bin/kubexit', '/kubexit/kubexit']
         volumeMounts:
         - mountPath: /kubexit
           name: kubexit

diff --git a/examples/client-server-job/kubexit.log b/examples/client-server-job/kubexit.log
diff --git a/examples/client-server-job/server.log b/examples/client-server-job/server.log
@@ -13,11 +13,13 @@ Tombstone modified: client
 Reading tombstone: client
 Tombstone modified: client
 Reading tombstone: client
-127.0.0.1 - - [28/Apr/2020:09:42:39 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.67.0" "-"
+Tombstone modified: client
+Reading tombstone: client
+127.0.0.1 - - [28/Apr/2020:10:41:47 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.67.0" "-"
 Tombstone modified: client
 Reading tombstone: client
 New death: client
-Tombstone(client): &{Born:2020-04-28 09:42:39.1738453 +0000 UTC Died:2020-04-28 09:42:39.1960628 +0000 UTC ExitCode:0xc0000b0200 Graveyard:/graveyard Name:client fileLock:{state:0 sema:0}}
+Tombstone(client): {"Born":"2020-04-28T10:41:46.9926314Z","Died":"2020-04-28T10:41:47.0498724Z","ExitCode":0}
 Terminating child process...
 Tombstone Watch(/graveyard): done
 Exit(0)