openshift 4.3 build config & hpa

video for build config & scale up

• https://youtu.be/O0TjPBisMVo
• https://www.bilibili.com/video/BV1rT4y137QJ/
• https://www.ixigua.com/i6824464593977344525/

video for scale up & service

• https://youtu.be/6fMe7T4RlCI
• https://www.bilibili.com/video/BV1Xt4y1y7xG/
• https://www.ixigua.com/i6824739572237206023/

php build config

# 准备一个php的测试镜像
cat << EOF > php.dockerfile
FROM php:apache
COPY . /var/www/html/
EOF

cat <<EOF > index.php
<?php
ECHO "Hello!<br>";
echo "Welcome to RedHat Developer<br>";
EcHo "Enjoy all of the ad-free articles<br>";
?>
EOF

buildah build-using-dockerfile -t docker.io/wangzheng422/php:demo -f php.dockerfile .

podman run -it --rm -p 18080:80 --name my-running-app docker.io/wangzheng422/php:demo

# 创建一个git服务器，用gogs，启动以后要做一些配置。
# 配置 resolve.conf
# 配置 app.ini
# [webhook]
# SKIP_TLS_VERIFY  = true

mkdir -p /data/ocp4/gogs
podman run -d --name=gogs -p 10022:22 -p 10080:3000 -v /data/ocp4/gogs:/data:Z registry.redhat.ren:5443/docker.io/gogs/gogs

podman stop gogs
podman start gogs
# http://registry.redhat.ren:10080

# 在demo项目中，创建编译配置
oc project demo

oc import-image php:apache-wzh --from=registry.redhat.ren:5443/docker.io/library/php:apache-wzh --confirm

# oc import-image php:apache-wzh --from=registry.redhat.ren:5443/docker.io/wangzheng422/php:apache --confirm

oc create is php-sample -n demo

cat << EOF > bc.is.yaml
kind: BuildConfig
apiVersion: build.openshift.io/v1
metadata:
  name: "php-sample-build" 
spec:
  runPolicy: "Serial" 
  triggers: 
    - type: "Generic"
      generic:
        secret: "secret101"
    -
      type: "ImageChange"
  source: 
    git:
      uri: "http://registry.redhat.ren:10080/root/php"
    dockerfile: "FROM php:apache\nCOPY . /var/www/html/" 
  strategy: 
    dockerStrategy:
      from:
        kind: "ImageStreamTag"
        name: "php:apache-wzh"
  output: 
    to:
      kind: "ImageStreamTag"
      name: "php-sample:demo"
EOF
oc apply -f bc.is.yaml

# 在界面上操作，通过镜像创建应用，并通过代码更改，触发应用的重新部署。

hpa

我们在这里展示openshift如何根据cpu的负载，自动扩缩pod的数量。

video

• https://youtu.be/_UTncz3StXE
• https://www.bilibili.com/video/BV1Tk4y1r7Be/

# oc autoscale dc/php-sample \
#   --min 1 \
#   --max 3 \
#   --cpu-percent=50 

# 根据已经创建的deployment，创建HPA
cat << 'EOF' > demo.hpa.yaml
kind: HorizontalPodAutoscaler
apiVersion: autoscaling/v2beta1
metadata:
  name: php-sample
  namespace: demo
spec:
  scaleTargetRef:
    kind: Deployment
    name: php-sample
    apiVersion: apps/v1
  minReplicas: 1
  maxReplicas: 3
  metrics:
    - type: Resource
      resource:
        name: cpu
        targetAverageUtilization: 50
EOF
oc apply -n demo -f demo.hpa.yaml

# 为了不影响其他测试，我们把php pod定点到同一个交换机主机上
cat << 'EOF'
nodeSelector:
    kubernetes.io/hostname: 'infra1.hsc.redhat.ren'
EOF

# 为了更好的展示效果，我们限制cpu使用量
cat << 'EOF'
    resources:
      requests:
        cpu: '100m'
        memory: "1G"
      limits:
        cpu: '100m'
        memory: "1G"
EOF

# 开始压力
ab -c 100 -n 99999 http://php-sample-demo.apps.ocpsc.redhat.ren/

# 查看当前hpa的状态
oc describe hpa/php-sample

弯路

skopeo copy docker://docker.io/php:apache docker-archive:///root/tmp/php.tar
gzip php.tar

skopeo copy docker-archive:///data/ocp4/tmp/php.tar.gz docker://registry.redhat.ren:5443/docker.io/library/php:apache

skopeo copy docker://docker.io/wangzheng422/php:apache docker://registry.redhat.ren:5443/docker.io/wangzheng422/php:apache

cat << EOF > docker.php.sh
#!/usr/bin/env bash

set -e
set -x

buildah from --name onbuild-container docker.io/php:apache
buildah run onbuild-container sed -i "s/80/8080/g" /etc/apache2/sites-available/000-default.conf /etc/apache2/ports.conf
buildah umount onbuild-container 
buildah config -p 8080 onbuild-container
buildah commit --squash --rm --format=docker onbuild-container docker.io/wangzheng422/php:apache
buildah push docker.io/wangzheng422/php:apache
EOF
bash docker.php.sh

cat << EOF > docker.php.sh
#!/usr/bin/env bash

set -e
set -x

buildah from --name onbuild-container registry.redhat.ren:5443/docker.io/library/php:apache
buildah run onbuild-container sed -i "s/80/8080/g" /etc/apache2/sites-available/000-default.conf /etc/apache2/ports.conf
buildah umount onbuild-container 
buildah config -p 8080 onbuild-container
buildah commit --squash --rm --format=docker onbuild-container registry.redhat.ren:5443/docker.io/library/php:apache-wzh
buildah push registry.redhat.ren:5443/docker.io/library/php:apache-wzh
EOF
bash docker.php.sh

# 我们不需要复杂的 template
oc get template -n openshift | grep php

# 用 source to image 功能就可以，所有找一下image stream
oc get is -A | grep php

# 我们把sample operator的状态改一下
oc get configs.samples.operator.openshift.io/cluster -o yaml

oc patch configs.samples.operator.openshift.io/cluster -p '{"spec":{"managementState": "Unmanaged"}}' --type=merge

export LOCAL_REG='registry.redhat.ren:5443'

var_is_name='php'
var_json=$(oc get is ${var_is_name} -n openshift -o json)

var_j=0
for var_is_tag in $(echo $var_json | jq -r ".spec.tags[].name"); do
    var_is_image_name=$(echo $var_json | jq -r ".spec.tags[${var_j}].from.name")
        
    var_is_image_kind=$(echo $var_json | jq -r ".spec.tags[${var_j}].from.kind")
    
    if [[ $var_is_image_kind =~ 'DockerImage'  ]]; then
        var_new_is_image_name="${LOCAL_REG}/$var_is_image_name"
        
        echo "###############################"
        echo $var_is_image_name
        echo $var_is_image_kind
        echo $var_new_is_image_name
        echo $var_is_tag

        oc patch -n openshift is ${var_is_name} --type='json' -p="[{\"op\": \"replace\", \"path\": \"/spec/tags/${var_j}/from/name\", \"value\":\"${var_new_is_image_name}\"}]"
    fi
    var_j=$((var_j+1))
done