🥇Blue-Green Deployment ma ka uku haʻahaʻa

Ma kēia ʻatikala mākou e hoʻohana ai ke kī, kālepa, ka loea и nginx E hoʻonohonoho mākou i kahi hoʻolālā maʻalahi o ka noi pūnaewele. Polu-'ōmaʻomaʻo hoʻolaha He ʻenehana ia e hiki ai iā ʻoe ke hoʻololi koke i kahi noi me ka hōʻole ʻole i kahi noi hoʻokahi. ʻO ia kekahi o nā hoʻolālā hoʻolālā zero downtime a kūpono loa ia no nā noi me hoʻokahi laʻana, akā ʻo ka hiki ke hoʻouka i kahi lua, mākaukau e holo kokoke.

E ʻōlelo mākou he polokalamu pūnaewele kāu e hana ikaika nei nā mea kūʻai aku, a ʻaʻohe ala e moe ai i lalo no ʻelua kekona. A pono ʻoe e ʻōwili i kahi hoʻolaha waihona, hoʻoponopono bug, a i ʻole kahi hiʻohiʻona hou. Ma kahi kūlana maʻamau, pono ʻoe e hoʻōki i ka noi, hoʻololi a hoʻomaka hou. I ka hihia o docker, hiki iā ʻoe ke hoʻololi mua iā ia, a laila hoʻomaka hou, akā aia nō kahi manawa e hoʻokō ʻole ʻia ai nā noi i ka noi, no ka mea maʻamau ka manawa o ka noi e hoʻouka mua. He aha inā e hoʻomaka ana, akā ʻaʻole hiki ke hana? ʻO kēia ka pilikia, e hoʻoponopono kākou me ka liʻiliʻi a me ka nani e like me ka hiki.

NĀ HOʻOPIʻI: Hōʻike ʻia ka hapa nui o ka ʻatikala ma kahi ʻano hoʻokolohua - ma ke ʻano o ka hoʻopaʻa ʻana i kahi hālāwai console. Lana ka manaʻo ʻaʻole paʻakikī loa kēia e hoʻomaopopo a e kākau pono ke code iā ia iho. No ka lewa, e noʻonoʻo ʻaʻole kēia he snippet code wale nō, akā he pepa mai kahi teletype "hao".

Hōʻike ʻia nā ʻenehana hoihoi i paʻakikī iā Google ma ka heluhelu ʻana i ke code ma ka hoʻomaka o kēlā me kēia ʻāpana. Inā maopopo ʻole kekahi mea, google a nānā. explainshell (ʻO ka pōmaikaʻi, hana hou ia, ma muli o ka wehe ʻana o ke kelepona). Inā ʻaʻole hiki iā ʻoe ke Google i kekahi mea, e nīnau i nā manaʻo. E hauʻoli wau e hoʻohui i ka ʻāpana pili "Nā ʻenehana hoihoi".

E hoʻomaka kākou

$ mkdir blue-green-deployment && cd $_

hana

E hana kāua i lawelawe hoʻokolohua a waiho i loko o kahi pahu.

Nā ʻenehana hoihoi

cat << EOF > file-name (Eia Palapala + Hoʻoholo hou I/O) he ala ia e hana ai i kahi faila multi-line me hoʻokahi kauoha. Heluhelu mai ka bash a pau /dev/stdin ma hope o kēia laina a ma mua o ka laina EOF e hoʻopaʻa ʻia ma file-name.
wget -qO- URL (explainshell) - hoʻopuka i kahi palapala i loaʻa ma o HTTP i /dev/stdout (analogue curl URL).

Paipai

Hoʻokaʻawale wau i ka snippet e hiki ai ke hōʻike i ka Python. Ma ka hopena e loaʻa hou kahi ʻāpana e like me kēia. E noʻonoʻo i kēia mau wahi i ʻoki ʻia ai ka pepa e hoʻouna ʻia i ke keʻena hoʻokalakupua (kahi i pena lima ʻia ke code me nā mea highlighters), a laila hoʻopili ʻia kēia mau ʻāpana.

$ cat << EOF > uptimer.py

from http.server import BaseHTTPRequestHandler, HTTPServer
from time import monotonic

app_version = 1
app_name = f'Uptimer v{app_version}.0'
loading_seconds = 15 - app_version * 5

class Handler(BaseHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/':
            try:
                t = monotonic() - server_start
                if t < loading_seconds:
                    self.send_error(503)
                else:
                    self.send_response(200)
                    self.send_header('Content-Type', 'text/html')
                    self.end_headers()
                    response = f'<h2>{app_name} is running for {t:3.1f} seconds.</h2>n'
                    self.wfile.write(response.encode('utf-8'))
            except Exception:
                self.send_error(500)
        else:
            self.send_error(404)

httpd = HTTPServer(('', 8080), Handler)
server_start = monotonic()
print(f'{app_name} (loads in {loading_seconds} sec.) started.')
httpd.serve_forever()

EOF

$ cat << EOF > Dockerfile
FROM python:alpine
EXPOSE 8080
COPY uptimer.py app.py
CMD [ "python", "-u", "./app.py" ]
EOF

$ docker build --tag uptimer .
Sending build context to Docker daemon  39.42kB
Step 1/4 : FROM python:alpine
 ---> 8ecf5a48c789
Step 2/4 : EXPOSE 8080
 ---> Using cache
 ---> cf92d174c9d3
Step 3/4 : COPY uptimer.py app.py
 ---> a7fbb33d6b7e
Step 4/4 : CMD [ "python", "-u", "./app.py" ]
 ---> Running in 1906b4bd9fdf
Removing intermediate container 1906b4bd9fdf
 ---> c1655b996fe8
Successfully built c1655b996fe8
Successfully tagged uptimer:latest

$ docker run --rm --detach --name uptimer --publish 8080:8080 uptimer
8f88c944b8bf78974a5727070a94c76aa0b9bb2b3ecf6324b784e782614b2fbf

$ docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                    NAMES
8f88c944b8bf        uptimer             "python -u ./app.py"   3 seconds ago       Up 5 seconds        0.0.0.0:8080->8080/tcp   uptimer

$ docker logs uptimer
Uptimer v1.0 (loads in 10 sec.) started.

$ wget -qSO- http://localhost:8080
  HTTP/1.0 503 Service Unavailable
  Server: BaseHTTP/0.6 Python/3.8.3
  Date: Sat, 22 Aug 2020 19:52:40 GMT
  Connection: close
  Content-Type: text/html;charset=utf-8
  Content-Length: 484

$ wget -qSO- http://localhost:8080
  HTTP/1.0 200 OK
  Server: BaseHTTP/0.6 Python/3.8.3
  Date: Sat, 22 Aug 2020 19:52:45 GMT
  Content-Type: text/html
<h2>Uptimer v1.0 is running for 15.4 seconds.</h2>

$ docker rm --force uptimer
uptimer

Hoʻololi i ka mea koho

I mea e hiki ai i kā mākou noi ke hoʻololi me ka ʻike ʻole ʻia, pono e loaʻa kekahi mea ʻē aʻe i mua o ia e hūnā i kāna pani. He kikowaena pūnaewele paha nginx в hoʻololi i ke ʻano koho. Hoʻokumu ʻia kahi koho hope ma waena o ka mea kūʻai aku a me ka noi. ʻAe ʻo ia i nā noi mai nā mea kūʻai aku a hoʻouna iā lākou i ka palapala noi a hoʻouna i nā pane o ka noi i nā mea kūʻai aku.

Hiki ke hoʻopili ʻia ka noi a me ka proxy reverse i loko o ka docker me ka hoʻohana ʻana ʻupena docker. No laila, ʻaʻole pono ka pahu me ka noi e hoʻouna i kahi awa ma ka ʻōnaehana hoʻokipa; hiki i kēia ke hoʻokaʻawale ʻia ka noi mai nā hoʻoweliweli o waho.

Inā noho ka mea koho hope ma luna o kahi mea hoʻokipa ʻē aʻe, pono ʻoe e haʻalele i ka pūnaewele docker a hoʻopili i ka noi i ka mea koho hope ma o ka pūnaewele host, e hoʻouna i ke awa. Apps hoʻohālikelike --publish, e like me ka hoʻomaka mua a me ka mea koho hope.

E holo mākou i ka hoʻololi hope ma ke awa 80, no ka mea, ʻo ia ka mea pono e hoʻolohe i ka pūnaewele waho. Inā paʻa ka port 80 i kāu host hoʻāʻo, e hoʻololi i ka ʻāpana --publish 80:80 maluna o --publish ANY_FREE_PORT:80.

Nā ʻenehana hoihoi

"Ma nā pūnaewele Docker i hana ʻia e ka mea hoʻohana, hiki iā ʻoe ke kamaʻilio me nā pahu ʻaʻole wale ma ka IP address. Hoʻoholo ʻia ka inoa pahu i kāna helu IP" (ʻatikala "Ka pūnaewele me nā ipu kūʻokoʻa", ʻāpana "E hoʻohana i nā ʻupena alahaka i wehewehe ʻia e ka mea hoʻohana", helu 5 o ke code docker).

Paipai

$ docker network create web-gateway
5dba128fb3b255b02ac012ded1906b7b4970b728fb7db3dbbeccc9a77a5dd7bd

$ docker run --detach --rm --name uptimer --network web-gateway uptimer
a1105f1b583dead9415e99864718cc807cc1db1c763870f40ea38bc026e2d67f

$ docker run --rm --network web-gateway alpine wget -qO- http://uptimer:8080
<h2>Uptimer v1.0 is running for 11.5 seconds.</h2>

$ docker run --detach --publish 80:80 --network web-gateway --name reverse-proxy nginx:alpine
80695a822c19051260c66bf60605dcb4ea66802c754037704968bc42527bf120

$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                NAMES
80695a822c19        nginx:alpine        "/docker-entrypoint.…"   27 seconds ago       Up 25 seconds       0.0.0.0:80->80/tcp   reverse-proxy
a1105f1b583d        uptimer             "python -u ./app.py"     About a minute ago   Up About a minute   8080/tcp             uptimer

$ cat << EOF > uptimer.conf
server {
    listen 80;
    location / {
        proxy_pass http://uptimer:8080;
    }
}
EOF

$ docker cp ./uptimer.conf reverse-proxy:/etc/nginx/conf.d/default.conf

$ docker exec reverse-proxy nginx -s reload
2020/06/23 20:51:03 [notice] 31#31: signal process started

$ wget -qSO- http://localhost
  HTTP/1.1 200 OK
  Server: nginx/1.19.0
  Date: Sat, 22 Aug 2020 19:56:24 GMT
  Content-Type: text/html
  Transfer-Encoding: chunked
  Connection: keep-alive
<h2>Uptimer v1.0 is running for 104.1 seconds.</h2>

Hoʻolaha ʻole ʻia

E ʻōwili i kahi mana hou o ka noi (me ka hoʻonui ʻana i ka hana hoʻomaka ʻelua) a e hoʻāʻo e hoʻonohonoho pono.

Nā ʻenehana hoihoi

echo 'my text' | docker exec -i my-container sh -c 'cat > /my-file.txt' — Kākau kikokiko my text e waiho /my-file.txt loko o ka ipu my-container.
cat > /my-file.txt — Kākau i nā mea o ka hoʻokomo maʻamau i kahi faila /dev/stdin.

Paipai

$ sed -i "s/app_version = 1/app_version = 2/" uptimer.py

$ docker build --tag uptimer .
Sending build context to Docker daemon  39.94kB
Step 1/4 : FROM python:alpine
 ---> 8ecf5a48c789
Step 2/4 : EXPOSE 8080
 ---> Using cache
 ---> cf92d174c9d3
Step 3/4 : COPY uptimer.py app.py
 ---> 3eca6a51cb2d
Step 4/4 : CMD [ "python", "-u", "./app.py" ]
 ---> Running in 8f13c6d3d9e7
Removing intermediate container 8f13c6d3d9e7
 ---> 1d56897841ec
Successfully built 1d56897841ec
Successfully tagged uptimer:latest

$ docker run --detach --rm --name uptimer_BLUE --network web-gateway uptimer
96932d4ca97a25b1b42d1b5f0ede993b43f95fac3c064262c5c527e16c119e02

$ docker logs uptimer_BLUE
Uptimer v2.0 (loads in 5 sec.) started.

$ docker run --rm --network web-gateway alpine wget -qO- http://uptimer_BLUE:8080
<h2>Uptimer v2.0 is running for 23.9 seconds.</h2>

$ sed s/uptimer/uptimer_BLUE/ uptimer.conf | docker exec --interactive reverse-proxy sh -c 'cat > /etc/nginx/conf.d/default.conf'

$ docker exec reverse-proxy cat /etc/nginx/conf.d/default.conf
server {
    listen 80;
    location / {
        proxy_pass http://uptimer_BLUE:8080;
    }
}

$ docker exec reverse-proxy nginx -s reload
2020/06/25 21:22:23 [notice] 68#68: signal process started

$ wget -qO- http://localhost
<h2>Uptimer v2.0 is running for 63.4 seconds.</h2>

$ docker rm -f uptimer
uptimer

$ wget -qO- http://localhost
<h2>Uptimer v2.0 is running for 84.8 seconds.</h2>

$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                NAMES
96932d4ca97a        uptimer             "python -u ./app.py"     About a minute ago   Up About a minute   8080/tcp             uptimer_BLUE
80695a822c19        nginx:alpine        "/docker-entrypoint.…"   8 minutes ago        Up 8 minutes        0.0.0.0:80->80/tcp   reverse-proxy

I kēia pae, kūkulu pololei ʻia ke kiʻi ma luna o ke kikowaena, kahi e pono ai nā kumu noi ma laila, a hoʻouka pū i ke kikowaena me nā hana pono ʻole. ʻO ka hana aʻe e hoʻokaʻawale i ka hui kiʻi i kahi mīkini ʻokoʻa (no ka laʻana, i kahi ʻōnaehana CI) a laila hoʻololi iā ia i ke kikowaena.

Ke hoʻololi nei i nā kiʻi

ʻO ka mea pōʻino, ʻaʻole kūpono ke hoʻololi i nā kiʻi mai localhost i localhost, no laila hiki ke ʻimi wale ʻia kēia ʻāpana inā loaʻa iā ʻoe ʻelua mau pūʻali me Docker ma ka lima. Ma ka liʻiliʻi e like me kēia:

$ ssh production-server docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

$ docker image save uptimer | ssh production-server 'docker image load'
Loaded image: uptimer:latest

$ ssh production-server docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
uptimer             latest              1d56897841ec        5 minutes ago       78.9MB

hui docker save mālama i ka ʻikepili kiʻi i loko o kahi waihona .tar, ʻo ia hoʻi, ʻoi aku kona kaumaha ma kahi o 1.5 mau manawa ma mua o ke kaupaona ʻana ma ke ʻano paʻi. No laila, e lulu mākou ma ka inoa o ka mālama ʻana i ka manawa a me ke kaʻa:

$ docker image save uptimer | gzip | ssh production-server 'zcat | docker image load'
Loaded image: uptimer:latest

Hiki iā ʻoe ke nānā i ke kaʻina hoʻoiho (ʻoiai e koi ana kēia i kahi pono ʻaoʻao ʻekolu):

$ docker image save uptimer | gzip | pv | ssh production-server 'zcat | docker image load'
25,7MiB 0:01:01 [ 425KiB/s] [                   <=>    ]
Loaded image: uptimer:latest

Manaʻo kōkua: Inā makemake ʻoe i kahi hui o nā ʻāpana e hoʻopili i kahi kikowaena ma o SSH, ʻaʻole paha ʻoe e hoʻohana ana i ka faila ~/.ssh/config.

Hoʻololi i ke kiʻi ma o docker image save/load - ʻO kēia ke ʻano minimalistic, akā ʻaʻole hoʻokahi wale nō. Aia kekahi:

Kakau Kakau (industry standard).
Hoʻohui i ka docker daemon server mai kahi hoʻokipa ʻē aʻe:
1. hoʻololi kaiapuni DOCKER_HOST.
2. Koho laina kauoha -H ai ole ia, --host mea kani docker-compose.
3. docker context

ʻO ke ala ʻelua (me nā koho ʻekolu no kāna hoʻokō) ua wehewehe maikaʻi ʻia ma ka ʻatikala Pehea e kau ai ma nā pūnaewele Docker mamao me ka docker-compose.

`deploy.sh`

I kēia manawa, e hōʻiliʻili kāua i nā mea a pau a mākou i hana lima ai i hoʻokahi palapala. E hoʻomaka kākou me ka hana kiʻekiʻe, a laila e nānā i nā mea ʻē aʻe i hoʻohana ʻia i loko.

Nā ʻenehana hoihoi

${parameter?err_msg} - kekahi o nā mea kilokilo bash (aka hoʻololi hoʻohālikelike). Inā parameter aole i hoakakaia, puka err_msg a puka i waho me ke code 1.
docker --log-driver journald - ma ka paʻamau, ʻo ka mea hoʻokele logging docker he faila kikokikona me ka ʻole o ka hoʻololi ʻana. Me kēia ala, hoʻopiha koke nā lāʻau i ka diski holoʻokoʻa, no laila no kahi hana hana pono e hoʻololi i ka mea hoʻokele i kahi mea akamai.

Palapala hoʻolālā

deploy() {
    local usage_msg="Usage: ${FUNCNAME[0]} image_name"
    local image_name=${1?$usage_msg}

    ensure-reverse-proxy || return 2
    if get-active-slot $image_name
    then
        local OLD=${image_name}_BLUE
        local new_slot=GREEN
    else
        local OLD=${image_name}_GREEN
        local new_slot=BLUE
    fi
    local NEW=${image_name}_${new_slot}
    echo "Deploying '$NEW' in place of '$OLD'..."
    docker run 
        --detach 
        --restart always 
        --log-driver journald 
        --name $NEW 
        --network web-gateway 
        $image_name || return 3
    echo "Container started. Checking health..."
    for i in {1..20}
    do
        sleep 1
        if get-service-status $image_name $new_slot
        then
            echo "New '$NEW' service seems OK. Switching heads..."
            sleep 2  # Ensure service is ready
            set-active-slot $image_name $new_slot || return 4
            echo "'$NEW' service is live!"
            sleep 2  # Ensure all requests were processed
            echo "Killing '$OLD'..."
            docker rm -f $OLD
            docker image prune -f
            echo "Deployment successful!"
            return 0
        fi
        echo "New '$NEW' service is not ready yet. Waiting ($i)..."
    done
    echo "New '$NEW' service did not raise, killing it. Failed to deploy T_T"
    docker rm -f $NEW
    return 5
}

Nā hiʻohiʻona i hoʻohana ʻia:

ensure-reverse-proxy - E hōʻoia i ka hana ʻana o ka mea koho hope (pono no ka hoʻoili mua ʻana)
get-active-slot service_name - E hoʻoholo i kahi slot e hana nei no kahi lawelawe i hāʻawi ʻia (BLUE ai ole ia, GREEN)
get-service-status service_name deployment_slot - Hoʻoholo inā mākaukau ka lawelawe e hoʻoponopono i nā noi e hiki mai ana
set-active-slot service_name deployment_slot - Hoʻololi i ka config nginx i loko o ka pahu koho hope

I ke kauoha:

ensure-reverse-proxy() {
    is-container-up reverse-proxy && return 0
    echo "Deploying reverse-proxy..."
    docker network create web-gateway
    docker run 
        --detach 
        --restart always 
        --log-driver journald 
        --name reverse-proxy 
        --network web-gateway 
        --publish 80:80 
        nginx:alpine || return 1
    docker exec --interactive reverse-proxy sh -c "> /etc/nginx/conf.d/default.conf"
    docker exec reverse-proxy nginx -s reload
}

is-container-up() {
    local container=${1?"Usage: ${FUNCNAME[0]} container_name"}

    [ -n "$(docker ps -f name=${container} -q)" ]
    return $?
}

get-active-slot() {
    local service=${1?"Usage: ${FUNCNAME[0]} service_name"}

    if is-container-up ${service}_BLUE && is-container-up ${service}_GREEN; then
        echo "Collision detected! Stopping ${service}_GREEN..."
        docker rm -f ${service}_GREEN
        return 0  # BLUE
    fi
    if is-container-up ${service}_BLUE && ! is-container-up ${service}_GREEN; then
        return 0  # BLUE
    fi
    if ! is-container-up ${service}_BLUE; then
        return 1  # GREEN
    fi
}

get-service-status() {
    local usage_msg="Usage: ${FUNCNAME[0]} service_name deployment_slot"
    local service=${1?usage_msg}
    local slot=${2?$usage_msg}

    case $service in
        # Add specific healthcheck paths for your services here
        *) local health_check_port_path=":8080/" ;;
    esac
    local health_check_address="http://${service}_${slot}${health_check_port_path}"
    echo "Requesting '$health_check_address' within the 'web-gateway' docker network:"
    docker run --rm --network web-gateway alpine 
        wget --timeout=1 --quiet --server-response $health_check_address
    return $?
}

set-active-slot() {
    local usage_msg="Usage: ${FUNCNAME[0]} service_name deployment_slot"
    local service=${1?$usage_msg}
    local slot=${2?$usage_msg}
    [ "$slot" == BLUE ] || [ "$slot" == GREEN ] || return 1

    get-nginx-config $service $slot | docker exec --interactive reverse-proxy sh -c "cat > /etc/nginx/conf.d/$service.conf"
    docker exec reverse-proxy nginx -t || return 2
    docker exec reverse-proxy nginx -s reload
}

kuleana pili i get-active-slot pono e wehewehe iki:

No ke aha e hoʻihoʻi mai ai i kahi helu a ʻaʻole hoʻopuka i kahi kaula?

Eia nō naʻe, ma ka hana kelepona ʻike mākou i ka hopena o kāna hana, a ʻoi aku ka maʻalahi o ka nānā ʻana i ke code exit me ka bash ma mua o ka nānā ʻana i kahi kaula. Eia kekahi, maʻalahi loa ka loaʻa ʻana o kahi kaula mai ia mea:
get-active-slot service && echo BLUE || echo GREEN.

Ua lawa anei nā kūlana ʻekolu e hoʻokaʻawale i nā mokuʻāina āpau?

ʻO nā mea ʻelua e lawa, ʻo ka mea hope ma ʻaneʻi no ka hoʻopiha piha, i ʻole e kākau else.

ʻO ka hana wale nō e hoʻihoʻi i nā configs nginx e waiho ʻole ʻia: get-nginx-config service_name deployment_slot. Ma ka hoʻohālikelike me ka nānā ʻana i ke olakino, hiki iā ʻoe ke hoʻonohonoho i kekahi config no kekahi lawelawe. ʻO nā mea hoihoi - wale nō cat <<- EOF, hiki iā ʻoe ke wehe i nā pā āpau i ka hoʻomaka. ʻOiaʻiʻo, ʻo ke kumukūʻai o ka formatting maikaʻi e hui pū ʻia me nā hakahaka, i kēia lā i manaʻo ʻia he ʻano maikaʻi ʻole. Akā ʻo ka bash forces tabs, a he mea maikaʻi nō hoʻi ka loaʻa ʻana o ka formatting maʻamau i ka config nginx. I ka pōkole, ʻo ka hui ʻana i nā ʻaoʻao me nā hakahaka ma aneʻi e like me ka hopena maikaʻi loa mai nā mea ʻino loa. Eia naʻe, ʻaʻole ʻoe e ʻike i kēia ma ka snippet ma lalo nei, no ka mea, "hana maikaʻi" ʻo Habr ma ka hoʻololi ʻana i nā ʻaoʻao āpau i 4 mau hakahaka a hana ʻole ʻia ʻo EOF. A eia ke ike ia.

I ʻole e ala ʻelua, e haʻi koke wau iā ʻoe cat << 'EOF', e halawai ana ma hope. Inā ʻoe e kākau maʻalahi cat << EOF, a laila i loko o ka heredoc ua hoʻopili ʻia ke kaula (ua hoʻonui ʻia nā mea hoʻololi ($foo), kahea kauoha ($(bar)) a me nā mea ʻē aʻe), a inā ʻoe e hoʻopili i ka hope o ka palapala i nā huaʻōlelo hoʻokahi, a laila ua pio ka interpolation a me ka hōʻailona. $ hōʻike ʻia e like me ia. ʻO kāu mea e pono ai e hoʻokomo i kahi palapala i loko o kahi palapala ʻē aʻe.

get-nginx-config() {
    local usage_msg="Usage: ${FUNCNAME[0]} service_name deployment_slot"
    local service=${1?$usage_msg}
    local slot=${2?$usage_msg}
    [ "$slot" == BLUE ] || [ "$slot" == GREEN ] || return 1

    local container_name=${service}_${slot}
    case $service in
        # Add specific nginx configs for your services here
        *) nginx-config-simple-service $container_name:8080 ;;
    esac
}

nginx-config-simple-service() {
    local usage_msg="Usage: ${FUNCNAME[0]} proxy_pass"
    local proxy_pass=${1?$usage_msg}

cat << EOF
server {
    listen 80;
    location / {
        proxy_pass http://$proxy_pass;
    }
}
EOF
}

ʻO kēia ka palapala holoʻokoʻa. A pēlā mea nui me kēia palapala no ka hoʻoiho ʻana ma o wget a i ʻole curl.

Ke hoʻokō ʻana i nā ʻōkuhi i hoʻohālikelike ʻia ma kahi kikowaena mamao

ʻO ka manawa kēia e kīkēkē ai i ke kikowaena kikowaena. ʻO kēia manawa localhost kūpono loa:

$ ssh-copy-id localhost
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
himura@localhost's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'localhost'"
and check to make sure that only the key(s) you wanted were added.

Ua kākau mākou i kahi palapala hoʻolālā e hoʻoiho i kahi kiʻi i kūkulu mua ʻia i ka server i hoʻopaʻa ʻia a hoʻololi pono i ka ipu lawelawe, akā pehea mākou e hoʻokō ai ma kahi mīkini mamao? He mau hoʻopaʻapaʻa ka palapala, no ka mea, he honua a hiki ke kau i nā lawelawe i ka manawa hoʻokahi ma lalo o hoʻokahi proxy reverse (hiki iā ʻoe ke hoʻohana i nā configs nginx e hoʻoholo ai i ka url e lawelawe ai). ʻAʻole hiki ke mālama ʻia ka ʻatikala ma ka kikowaena, no ka mea, ʻaʻole hiki iā mākou ke hoʻololi maʻalahi iā ia (no ka hoʻoponopono ʻana i ka bug a me ka hoʻohui ʻana i nā lawelawe hou), a ma ka laulā, state = evil.

Pane 1: E mālama mau i ka palapala ma ke kikowaena, akā e kope i kēlā me kēia manawa scp. A laila hoʻohui ma o ssh a hoʻokō i ka palapala me nā manaʻo kūpono.

ʻAla:

ʻElua hana ma kahi o hoʻokahi
ʻAʻohe wahi āu e kope ai, a i ʻole hiki ke komo i laila, a i ʻole e hoʻokō ʻia ka palapala i ka manawa o ka hoʻololi ʻana.
He mea pono e hoʻomaʻemaʻe ma hope o ʻoe iho (hoʻopau i ka palapala).
ʻEkolu mau hana.

Pane 2:

E mālama i nā wehewehe hana wale nō ma ka palapala a ʻaʻohe holo iki
Me ke kōkuaʻana o sed hoʻohui i kahi kelepona hana i ka hopena
E hoʻouna pololei iā shh ma o ka paipu (|)

Kākoʻo:

Mokuaina ole maoli
ʻAʻohe mea hoʻohuihui boilerplate
Manaʻo hauʻoli

E hana wale kākou me ka ʻole o Ansible. ʻAe, ua haku ʻia nā mea a pau. ʻAe, he paikikala. E nānā i ka maʻalahi, ka nani a me ka minimalistic o ke kaʻa.

$ cat << 'EOF' > deploy.sh

#!/bin/bash

usage_msg="Usage: $0 ssh_address local_image_tag"
ssh_address=${1?$usage_msg}
image_name=${2?$usage_msg}

echo "Connecting to '$ssh_address' via ssh to seamlessly deploy '$image_name'..."
( sed "$a deploy $image_name" | ssh -T $ssh_address ) << 'END_OF_SCRIPT'
deploy() {
    echo "Yay! The '${FUNCNAME[0]}' function is executing on '$(hostname)' with argument '$1'"
}
END_OF_SCRIPT

EOF

$ chmod +x deploy.sh

$ ./deploy.sh localhost magic-porridge-pot
Connecting to localhost...
Yay! The 'deploy' function is executing on 'hut' with argument 'magic-porridge-pot'

Eia nō naʻe, ʻaʻole hiki iā mākou ke hōʻoia ua lawa ka bash i ka host mamao, no laila e hoʻohui mākou i kahi helu liʻiliʻi i ka hoʻomaka (ʻo ia ma kahi o hoʻopāpā):

if [ "$SHELL" != "/bin/bash" ]
then
    echo "The '$SHELL' shell is not supported by 'deploy.sh'. Set a '/bin/bash' shell for '$USER@$HOSTNAME'."
    exit 1
fi

A i kēia manawa he mea maoli:

$ docker exec reverse-proxy rm /etc/nginx/conf.d/default.conf

$ wget -qO deploy.sh https://git.io/JUURc

$ chmod +x deploy.sh

$ ./deploy.sh localhost uptimer
Sending gzipped image 'uptimer' to 'localhost' via ssh...
Loaded image: uptimer:latest
Connecting to 'localhost' via ssh to seamlessly deploy 'uptimer'...
Deploying 'uptimer_GREEN' in place of 'uptimer_BLUE'...
06f5bc70e9c4f930e7b1f826ae2ca2f536023cc01e82c2b97b2c84d68048b18a
Container started. Checking health...
Requesting 'http://uptimer_GREEN:8080/' within the 'web-gateway' docker network:
  HTTP/1.0 503 Service Unavailable
wget: server returned error: HTTP/1.0 503 Service Unavailable
New 'uptimer_GREEN' service is not ready yet. Waiting (1)...
Requesting 'http://uptimer_GREEN:8080/' within the 'web-gateway' docker network:
  HTTP/1.0 503 Service Unavailable
wget: server returned error: HTTP/1.0 503 Service Unavailable
New 'uptimer_GREEN' service is not ready yet. Waiting (2)...
Requesting 'http://uptimer_GREEN:8080/' within the 'web-gateway' docker network:
  HTTP/1.0 200 OK
  Server: BaseHTTP/0.6 Python/3.8.3
  Date: Sat, 22 Aug 2020 20:15:50 GMT
  Content-Type: text/html

New 'uptimer_GREEN' service seems OK. Switching heads...
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
2020/08/22 20:15:54 [notice] 97#97: signal process started
The 'uptimer_GREEN' service is live!
Killing 'uptimer_BLUE'...
uptimer_BLUE
Total reclaimed space: 0B
Deployment successful!

I kēia manawa hiki iā ʻoe ke wehe http://localhost/ i loko o ka polokalamu kele pūnaewele, e holo hou i ka hoʻolālā a e hōʻoia i ka holo pono ʻana ma ka hoʻonui ʻana i ka ʻaoʻao e like me ka CD i ka wā o ka hoʻolālā.

Mai poina e hoʻomaʻemaʻe ma hope o ka hana :3

$ docker rm -f uptimer_GREEN reverse-proxy 
uptimer_GREEN
reverse-proxy

$ docker network rm web-gateway 
web-gateway

$ cd ..

$ rm -r blue-green-deployment

Source: www.habr.com

Polū-Green Deployment ma nā uku liʻiliʻi

hana

Nā ʻenehana hoihoi

Paipai

Hoʻololi i ka mea koho

Nā ʻenehana hoihoi

Paipai

Hoʻolaha ʻole ʻia

Nā ʻenehana hoihoi

Paipai

Ke hoʻololi nei i nā kiʻi

deploy.sh

Nā ʻenehana hoihoi

Palapala hoʻolālā

Ke hoʻokō ʻana i nā ʻōkuhi i hoʻohālikelike ʻia ma kahi kikowaena mamao

Mai poina e hoʻomaʻemaʻe ma hope o ka hana :3

`deploy.sh`