はじめに
minishift V1.28.0にRed Hat Container Catalog(RHCC)にあるPython3.6のイメージを観察しつつ
S2IでDjango2のプロジェクトを動作させることを目的に試行錯誤します。
- Win10環境でDjango2のREST APIを試してみる
- minishift V1.28.0でDjango2を動かす①：テンプレート確認
- minishift V1.28.0でDjango2を動かす②：テンプレート＆s2iソースの作成
- minishift V1.28.0でDjango2を動かす③：s2iソースの修正＆ビルド
- minishift V1.28.0でDjango2を動かす④：残課題
- minishift V1.28.0でnginx+gunicorn+Django2を動かす
- minishift V1.28.0でnginx+gunicorn+Django2を動かす。あっcreatesuperuser忘れてた(笑)
- openshiftに対応するためのDjango2コーディング時に気を付けるべき点
Red Hat Container Catalog(RHCC)のPythonイメージを勉強する
Red Hat Container Catalog(RHCC)にアクセスしPythonで検索
Tagsタブを表示します。
TagNameで最新版をクリックしDockerfileを確認します。
Dockerfileを覗く
Dockerfile
# This image provides a Python 3.6 environment you can use to run your Python
# applications.
FROM rhscl/s2i-base-rhel7:1
EXPOSE 8080
ENV PYTHON_VERSION=3.6 \
PATH=$HOME/.local/bin/:$PATH \
PYTHONUNBUFFERED=1 \
PYTHONIOENCODING=UTF-8 \
LC_ALL=en_US.UTF-8 \
LANG=en_US.UTF-8 \
PIP_NO_CACHE_DIR=off
ENV SUMMARY="Platform for building and running Python $PYTHON_VERSION applications" \
DESCRIPTION="Python $PYTHON_VERSION available as container is a base platform for \
building and running various Python $PYTHON_VERSION applications and frameworks. \
Python is an easy to learn, powerful programming language. It has efficient high-level \
data structures and a simple but effective approach to object-oriented programming. \
Python's elegant syntax and dynamic typing, together with its interpreted nature, \
make it an ideal language for scripting and rapid application development in many areas \
on most platforms."
LABEL summary="$SUMMARY" \
description="$DESCRIPTION" \
io.k8s.description="$DESCRIPTION" \
io.k8s.display-name="Python 3.6" \
io.openshift.expose-services="8080:http" \
io.openshift.tags="builder,python,python36,rh-python36" \
com.redhat.component="rh-python36-container" \
name="rhscl/python-36-rhel7" \
version="1" \
usage="s2i build https://github.com/sclorg/s2i-python-container.git --context-dir=3.6/test/setup-test-app/ rhscl/python-36-rhel7 python-sample-app" \
maintainer="SoftwareCollections.org <sclorg@redhat.com>"
RUN INSTALL_PKGS="rh-python36 rh-python36-python-devel rh-python36-python-setuptools rh-python36-python-pip nss_wrapper \
httpd24 httpd24-httpd-devel httpd24-mod_ssl httpd24-mod_auth_kerb httpd24-mod_ldap \
httpd24-mod_session atlas-devel gcc-gfortran libffi-devel libtool-ltdl enchant" && \
yum install -y yum-utils && \
prepare-yum-repositories rhel-server-rhscl-7-rpms && \
yum -y --setopt=tsflags=nodocs install $INSTALL_PKGS && \
rpm -V $INSTALL_PKGS && \
# Remove redhat-logos (httpd dependency) to keep image size smaller.
rpm -e --nodeps redhat-logos && \
yum -y clean all --enablerepo='*'
# Copy the S2I scripts from the specific language image to $STI_SCRIPTS_PATH.
COPY ./s2i/bin/ $STI_SCRIPTS_PATH
# Copy extra files to the image.
COPY ./root/ /
# - Create a Python virtual environment for use by any application to avoid
# potential conflicts with Python packages preinstalled in the main Python
# installation.
# - In order to drop the root user, we have to make some directories world
# writable as OpenShift default security model is to run the container
# under random UID.
RUN source scl_source enable rh-python36 && \
virtualenv ${APP_ROOT} && \
chown -R 1001:0 ${APP_ROOT} && \
fix-permissions ${APP_ROOT} -P && \
rpm-file-permissions
USER 1001
# Set the default CMD to print the usage of the language image.
CMD $STI_SCRIPTS_PATH/usage
usageを確認するとGitのURLが書いてありました。
usage="s2i build https://github.com/sclorg/s2i-python-container.git --context-dir=3.6/test/setup-test-app/ rhscl/python-36-rhel7 python-sample-app" \
https://github.com/sclorg/s2i-python-container.git
3.6のディレクトリを進みます。
あやしいフォルダがありましたね。s2i/binを覗きます。
s2i/bin/assembleを覗く
セットアップ時つまりBuild時は
3.6/s2i/bin/assemble
#!/bin/bash
function is_django_installed() {
python -c "import django" &>/dev/null
}
function should_collectstatic() {
is_django_installed && [[ -z "$DISABLE_COLLECTSTATIC" ]]
}
function virtualenv_bin() {
if head "/etc/redhat-release" | grep -q "^Fedora"; then
virtualenv-${PYTHON_VERSION} $1
else
virtualenv $1
fi
}
# Install pipenv to the separate virtualenv to isolate it
# from system Python packages and packages in the main
# virtualenv. Executable is simlinked into ~/.local/bin
# to be accessible. This approach is inspired by pipsi
# (pip script installer).
function install_pipenv() {
echo "---> Installing pipenv packaging tool ..."
VENV_DIR=$HOME/.local/venvs/pipenv
virtualenv_bin "$VENV_DIR"
$VENV_DIR/bin/pip --isolated install -U pipenv
mkdir -p $HOME/.local/bin
ln -s $VENV_DIR/bin/pipenv $HOME/.local/bin/pipenv
}
set -e
shopt -s dotglob
echo "---> Installing application source ..."
mv /tmp/src/* "$HOME"
if [[ ! -z "$UPGRADE_PIP_TO_LATEST" ]]; then
echo "---> Upgrading pip to latest version ..."
pip install -U pip setuptools wheel
fi
if [[ ! -z "$ENABLE_PIPENV" ]]; then
install_pipenv
echo "---> Installing dependencies via pipenv ..."
if [[ -f Pipfile ]]; then
pipenv install --deploy
elif [[ -f requirements.txt ]]; then
pipenv install -r requirements.txt
fi
# pipenv check
elif [[ -f requirements.txt ]]; then
echo "---> Installing dependencies ..."
pip install -r requirements.txt
fi
if [[ -f setup.py && -z "$DISABLE_SETUP_PY_PROCESSING" ]]; then
echo "---> Installing application ..."
pip install .
fi
if should_collectstatic; then
(
echo "---> Collecting Django static files ..."
APP_HOME=$(readlink -f "${APP_HOME:-.}")
# Change the working directory to APP_HOME
PYTHONPATH="$(pwd)${PYTHONPATH:+:$PYTHONPATH}"
cd "$APP_HOME"
# Look for 'manage.py' in the current directory
manage_file=./manage.py
if [[ ! -f "$manage_file" ]]; then
echo "WARNING: seems that you're using Django, but we could not find a 'manage.py' file."
echo "'manage.py collectstatic' ignored."
exit
fi
if ! python $manage_file collectstatic --dry-run --noinput &> /dev/null; then
echo "WARNING: could not run 'manage.py collectstatic'. To debug, run:"
echo " $ python $manage_file collectstatic --noinput"
echo "Ignore this warning if you're not serving static files with Django."
exit
fi
python $manage_file collectstatic --noinput
)
fi
# set permissions for any installed artifacts
fix-permissions /opt/app-root
関係ありそうな大筋を辿ると
$UPGRADE_PIP_TO_LATESTが定義されていたら
pip install -U pip setuptools wheel
requirements.txtがあったら
pipenv install -r requirements.txt
djangoがあれば(?)
python manage.py collectstatic --noinput
s2i/bin/runを覗く
実行時つまりPod起動時はちょっと長そうですね(笑)
3.6/s2i/bin/run
#!/bin/bash
source /opt/app-root/etc/generate_container_user
set -e
function is_gunicorn_installed() {
hash gunicorn &>/dev/null
}
function is_django_installed() {
python -c "import django" &>/dev/null
}
function should_migrate() {
is_django_installed && [[ -z "$DISABLE_MIGRATE" ]]
}
# Guess the number of workers according to the number of cores
function get_default_web_concurrency() {
limit_vars=$(cgroup-limits)
local $limit_vars
if [ -z "${NUMBER_OF_CORES:-}" ]; then
echo 1
return
fi
local max=$((NUMBER_OF_CORES*2))
# Require at least 43 MiB and additional 40 MiB for every worker
local default=$(((${MEMORY_LIMIT_IN_BYTES:-MAX_MEMORY_LIMIT_IN_BYTES}/1024/1024 - 43) / 40))
default=$((default > max ? max : default))
default=$((default < 1 ? 1 : default))
# According to http://docs.gunicorn.org/en/stable/design.html#how-many-workers,
# 12 workers should be enough to handle hundreds or thousands requests per second
default=$((default > 12 ? 12 : default))
echo $default
}
APP_HOME=$(readlink -f "${APP_HOME:-.}")
# Change the working directory to APP_HOME
PYTHONPATH="$(pwd)${PYTHONPATH:+:$PYTHONPATH}"
cd "$APP_HOME"
app_script_check="${APP_SCRIPT-}"
APP_SCRIPT="${APP_SCRIPT-app.sh}"
if [[ -f "$APP_SCRIPT" ]]; then
echo "---> Running application from script ($APP_SCRIPT) ..."
if [[ "$APP_SCRIPT" != /* ]]; then
APP_SCRIPT="./$APP_SCRIPT"
fi
exec "$APP_SCRIPT"
else
test -n "$app_script_check" && (>&2 echo "ERROR: file '$app_script_check' not found.") && exit 1
fi
app_file_check="${APP_FILE-}"
APP_FILE="${APP_FILE-app.py}"
if [[ -f "$APP_FILE" ]]; then
echo "---> Running application from Python script ($APP_FILE) ..."
exec python "$APP_FILE"
else
test -n "$app_file_check" && (>&2 echo "ERROR: file '$app_file_check' not found.") && exit 1
fi
# Look for 'manage.py' in the current directory
manage_file=./manage.py
if should_migrate; then
if [[ -f "$manage_file" ]]; then
echo "---> Migrating database ..."
python "$manage_file" migrate --noinput
else
echo "WARNING: seems that you're using Django, but we could not find a 'manage.py' file."
echo "Skipped 'python manage.py migrate'."
fi
fi
if is_gunicorn_installed; then
setup_py=$(find "$HOME" -maxdepth 2 -type f -name 'setup.py' -print -quit)
# Look for wsgi module in the current directory
if [[ -z "$APP_MODULE" && -f "./wsgi.py" ]]; then
APP_MODULE=wsgi
elif [[ -z "$APP_MODULE" && -f "$setup_py" ]]; then
APP_MODULE="$(python "$setup_py" --name)"
fi
if [[ "$APP_MODULE" ]]; then
export WEB_CONCURRENCY=${WEB_CONCURRENCY:-$(get_default_web_concurrency)}
echo "---> Serving application with gunicorn ($APP_MODULE) ..."
exec gunicorn "$APP_MODULE" --bind=0.0.0.0:8080 --access-logfile=- --config "$APP_CONFIG"
fi
fi
if is_django_installed; then
if [[ -f "$manage_file" ]]; then
echo "---> Serving application with 'manage.py runserver' ..."
echo "WARNING: this is NOT a recommended way to run you application in production!"
echo "Consider using gunicorn or some other production web server."
exec python "$manage_file" runserver 0.0.0.0:8080
else
echo "WARNING: seems that you're using Django, but we could not find a 'manage.py' file."
echo "Skipped 'python manage.py runserver'."
fi
fi
>&2 echo "ERROR: don't know how to run your application."
>&2 echo "Please set either APP_MODULE, APP_FILE or APP_SCRIPT environment variables, or create a file 'app.py' to launch your application."
exit 1
APP_SCRIPTに定義があれば
exec "$APP_SCRIPT"
APP_FILEに定義があれば
exec python "$APP_FILE"
djangoがあれば(?) && DISABLE_MIGRATEが定義されていなければ
python manage.py migrate --noinput
gunicornがインストールされており
wsgi.pyがあれば
gunicorn wsgi.py
setup.pyがあれば、それが指し示すpyを使って
gnuicorn setup.pyの中身
なければdjangoのrunserverで実行
といった感じでしょうか
minishift v1.28.0にバンドルされているPythonイメージで確認
ここにdjangoのサンプルgitがあるので参照します。
Sample Repository: https://github.com/openshift/django-ex.git
openshift/django-ex.gitを覗く
割とシンプルな構成ですね。
これをgit cloneしてdjango2に対応させることにしました。
openshift/templates/django.jsonを覗く
minishiftのテンプレート用jsoneはこんな感じ
ベースのイメージはpython:${PYTHON_VERSION}のようですね。
/sclorg/django-ex/master/openshift/templates/django.json
{
"kind": "Template",
"apiVersion": "v1",
"metadata": {
"name": "django-example",
"annotations": {
"openshift.io/display-name": "Django",
"description": "An example Django application with no database. For more information about using this template, including OpenShift considerations, see https://github.com/sclorg/django-ex/blob/master/README.md.",
"tags": "quickstart,python,django",
"iconClass": "icon-python",
"openshift.io/long-description": "This template defines resources needed to develop a Django based application, including a build configuration and application deployment configuration. It does not include a database.",
"openshift.io/provider-display-name": "Red Hat, Inc.",
"openshift.io/documentation-url": "https://github.com/sclorg/django-ex",
"openshift.io/support-url": "https://access.redhat.com",
"template.openshift.io/bindable": "false"
}
},
"labels": {
"template": "django-example",
"app": "django-example"
},
"message": "The following service(s) have been created in your project: ${NAME}.\n\nFor more information about using this template, including OpenShift considerations, see https://github.com/sclorg/django-ex/blob/master/README.md.",
"objects": [
{
"kind": "Secret",
"apiVersion": "v1",
"metadata": {
"name": "${NAME}"
},
"stringData" : {
"django-secret-key" : "${DJANGO_SECRET_KEY}"
}
},
{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "${NAME}",
"annotations": {
"description": "Exposes and load balances the application pods"
}
},
"spec": {
"ports": [
{
"name": "web",
"port": 8080,
"targetPort": 8080
}
],
"selector": {
"name": "${NAME}"
}
}
},
{
"kind": "Route",
"apiVersion": "v1",
"metadata": {
"name": "${NAME}"
},
"spec": {
"host": "${APPLICATION_DOMAIN}",
"to": {
"kind": "Service",
"name": "${NAME}"
}
}
},
{
"kind": "ImageStream",
"apiVersion": "v1",
"metadata": {
"name": "${NAME}",
"annotations": {
"description": "Keeps track of changes in the application image"
}
}
},
{
"kind": "BuildConfig",
"apiVersion": "v1",
"metadata": {
"name": "${NAME}",
"annotations": {
"description": "Defines how to build the application",
"template.alpha.openshift.io/wait-for-ready": "true"
}
},
"spec": {
"source": {
"type": "Git",
"git": {
"uri": "${SOURCE_REPOSITORY_URL}",
"ref": "${SOURCE_REPOSITORY_REF}"
},
"contextDir": "${CONTEXT_DIR}"
},
"strategy": {
"type": "Source",
"sourceStrategy": {
"from": {
"kind": "ImageStreamTag",
"namespace": "${NAMESPACE}",
"name": "python:${PYTHON_VERSION}"
},
"env": [
{
"name": "PIP_INDEX_URL",
"value": "${PIP_INDEX_URL}"
}
]
}
},
"output": {
"to": {
"kind": "ImageStreamTag",
"name": "${NAME}:latest"
}
},
"triggers": [
{
"type": "ImageChange"
},
{
"type": "ConfigChange"
},
{
"type": "GitHub",
"github": {
"secret": "${GITHUB_WEBHOOK_SECRET}"
}
}
],
"postCommit": {
"script": "./manage.py test"
}
}
},
{
"kind": "DeploymentConfig",
"apiVersion": "v1",
"metadata": {
"name": "${NAME}",
"annotations": {
"description": "Defines how to deploy the application server",
"template.alpha.openshift.io/wait-for-ready": "true"
}
},
"spec": {
"strategy": {
"type": "Rolling"
},
"triggers": [
{
"type": "ImageChange",
"imageChangeParams": {
"automatic": true,
"containerNames": [
"django-example"
],
"from": {
"kind": "ImageStreamTag",
"name": "${NAME}:latest"
}
}
},
{
"type": "ConfigChange"
}
],
"replicas": 1,
"selector": {
"name": "${NAME}"
},
"template": {
"metadata": {
"name": "${NAME}",
"labels": {
"name": "${NAME}"
}
},
"spec": {
"containers": [
{
"name": "django-example",
"image": " ",
"ports": [
{
"containerPort": 8080
}
],
"readinessProbe": {
"timeoutSeconds": 3,
"initialDelaySeconds": 3,
"httpGet": {
"path": "/",
"port": 8080
}
},
"livenessProbe": {
"timeoutSeconds": 3,
"initialDelaySeconds": 30,
"httpGet": {
"path": "/",
"port": 8080
}
},
"env": [
{
"name": "APP_CONFIG",
"value": "${APP_CONFIG}"
},
{
"name": "DJANGO_SECRET_KEY",
"valueFrom": {
"secretKeyRef" : {
"name" : "${NAME}",
"key" : "django-secret-key"
}
}
}
],
"resources": {
"limits": {
"memory": "${MEMORY_LIMIT}"
}
}
}
]
}
}
}
}
],
"parameters": [
{
"name": "NAME",
"displayName": "Name",
"description": "The name assigned to all of the frontend objects defined in this template.",
"required": true,
"value": "django-example"
},
{
"name": "NAMESPACE",
"displayName": "Namespace",
"required": true,
"description": "The OpenShift Namespace where the ImageStream resides.",
"value": "openshift"
},
{
"name": "PYTHON_VERSION",
"displayName": "Version of Python Image",
"description": "Version of Python image to be used (3.6 or latest).",
"value": "3.6",
"required": true
},
{
"name": "MEMORY_LIMIT",
"displayName": "Memory Limit",
"required": true,
"description": "Maximum amount of memory the container can use.",
"value": "512Mi"
},
{
"name": "SOURCE_REPOSITORY_URL",
"displayName": "Git Repository URL",
"required": true,
"description": "The URL of the repository with your application source code.",
"value": "https://github.com/sclorg/django-ex.git"
},
{
"name": "SOURCE_REPOSITORY_REF",
"displayName": "Git Reference",
"description": "Set this to a branch name, tag or other ref of your repository if you are not using the default branch."
},
{
"name": "CONTEXT_DIR",
"displayName": "Context Directory",
"description": "Set this to the relative path to your project if it is not in the root of your repository."
},
{
"name": "APPLICATION_DOMAIN",
"displayName": "Application Hostname",
"description": "The exposed hostname that will route to the Django service, if left blank a value will be defaulted.",
"value": ""
},
{
"name": "GITHUB_WEBHOOK_SECRET",
"displayName": "GitHub Webhook Secret",
"description": "Github trigger secret. A difficult to guess string encoded as part of the webhook URL. Not encrypted.",
"generate": "expression",
"from": "[a-zA-Z0-9]{40}"
},
{
"name": "APP_CONFIG",
"displayName": "Application Configuration File Path",
"description": "Relative path to Gunicorn configuration file (optional)."
},
{
"name": "DJANGO_SECRET_KEY",
"displayName": "Django Secret Key",
"description": "Set this to a long random string.",
"generate": "expression",
"from": "[\\w]{50}"
},
{
"name": "PIP_INDEX_URL",
"displayName": "Custom PyPi Index URL",
"description": "The custom PyPi index URL",
"value": ""
}
]
}
python:${PYTHON_VERSION}のDockerfileを覗く
上の記事につづく...と思ってましたが、RHCCのPython36イメージとminishiftのPythonテンプレートは異なるようでした。
まずはローカルにあるdocker imageを確認します。
[tak@centos76 ~]$ minishift ssh
[docker@minishift ~]$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
172.30.1.1:5000/django2/django2-example latest 5aace67fd4ac 5 minutes ago 714 MB
172.30.1.1:5000/django2/django2-example <none> 2b1a23ccd1fd 22 minutes ago 714 MB
172.30.1.1:5000/django2/django2-example <none> ea7cbd73ae20 5 hours ago 714 MB
172.30.1.1:5000/django2/django2-example <none> f2a8d5980d0f 5 hours ago 714 MB
<none> <none> 29600d17397e 5 hours ago 714 MB
172.30.1.1:5000/django2/django2-example <none> 76372cfdd9a2 6 hours ago 714 MB
172.30.1.1:5000/django2/django2-example <none> c26d1f15b033 6 hours ago 714 MB
172.30.1.1:5000/django2/django2-example <none> 9d0b29ca7adb 7 hours ago 714 MB
temp.builder.openshift.io/django2/django2-example-1 5974cab5 ec5193c72d6a 7 hours ago 714 MB
172.30.1.1:5000/django2/sample latest f804ece50a51 14 hours ago 714 MB
172.30.1.1:5000/django2/sample <none> 0838efeee68d 14 hours ago 714 MB
172.30.1.1:5000/django2/sample <none> d77e49caa741 15 hours ago 714 MB
172.30.1.1:5000/django2/sample <none> f0e22d3f4915 15 hours ago 714 MB
172.30.1.1:5000/django2/django-example latest 98fb365c52e3 41 hours ago 714 MB
<none> <none> 7b2bd8dbce2b 42 hours ago 714 MB
172.30.1.1:5000/django2/django-example <none> ecc540ed1a4a 2 days ago 714 MB
172.30.1.1:5000/django2/django-example <none> 1e2213f62c12 2 days ago 714 MB
172.30.1.1:5000/django2/django-example <none> 0fecb96f565e 2 days ago 714 MB
<none> <none> 2133ca89d999 2 days ago 714 MB
docker.io/openshift/origin-node v3.11.0 438d61da63d1 7 days ago 1.16 GB
docker.io/openshift/origin-control-plane v3.11.0 00f980c345c1 7 days ago 825 MB
docker.io/openshift/origin-hyperkube v3.11.0 d65ee3cc9874 7 days ago 506 MB
docker.io/openshift/origin-docker-builder v3.11.0 320e0c77623c 7 days ago 458 MB
docker.io/openshift/origin-haproxy-router v3.11.0 316c2621011d 7 days ago 407 MB
docker.io/openshift/origin-pod v3.11.0 045ddf827c75 7 days ago 258 MB
docker.io/openshift/origin-deployer v3.11.0 d05e619aac21 7 days ago 380 MB
docker.io/openshift/origin-hypershift v3.11.0 a777d85d24b9 7 days ago 546 MB
docker.io/openshift/origin-cli v3.11.0 83d7b0b2f011 7 days ago 380 MB
172.30.1.1:5000/openshift/python <none> 8c84620ebb62 2 weeks ago 686 MB
registry.access.redhat.com/rhscl/mariadb-101-rhel7 latest a4deee8ed5a5 4 weeks ago 455 MB
registry.access.redhat.com/rhscl/python-36-rhel7 latest 8c2f91ba249e 4 weeks ago 627 MB
registry.connect.redhat.com/bitnami/wordpress-nginx-php7 latest 2892cd4d344e 6 weeks ago 580 MB
docker.io/openshift/origin-web-console v3.11.0 be30b6cce5fa 2 months ago 339 MB
docker.io/openshift/origin-docker-registry v3.11.0 a0d5ad164395 2 months ago 305 MB
docker.io/openshift/origin-service-serving-cert-signer v3.11 47dadf9d43b6 2 months ago 276 MB
だいぶんゴミイメージが残ってます(笑)お掃除しなきゃですね。
172.30.1.1:5000/openshift/pythonがターゲットのイメージです。
Docker Imageの詳細を確認します。
[docker@minishift ~]$ docker inspect 8c84620ebb62
[
{
"Id": "sha256:8c84620ebb6246f82050006a743490af7a2a023dc1dac5287e5cbc203594fa34",
"RepoTags": [],
"RepoDigests": [
"172.30.1.1:5000/openshift/python@sha256:091d56e3ab03d52ef0ffac4b88e7e1fa24ea0243bfd05297882c12ff8a0ba1df"
],
"Parent": "",
"Comment": "",
"Created": "2018-12-11T06:41:53.712643695Z",
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]
https://github.com/sclorg/s2i-python-container.git
のcentos/python-36-centos7を確認する必要があるみたいですね。
って事で上の記事に戻る感じです(笑)