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davidkdavidk
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‎docs/visualize-demo/ide_expansion.html‎

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‎docs/visualize-demo/readme-fleet-expansion.cgr‎

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--- Expand README nginx rollout across a fleet ---
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set release_id = "2026.04.15"
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set web_names = "web-01,web-02,web-03,web-04,web-05,web-06,web-07,web-08,web-09,web-10,web-11,web-12"
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set web_hosts = "web-01:deploy@10.0.1.11,web-02:deploy@10.0.1.12,web-03:deploy@10.0.1.13,web-04:deploy@10.0.1.14,web-05:deploy@10.0.1.15,web-06:deploy@10.0.1.16,web-07:deploy@10.0.1.17,web-08:deploy@10.0.1.18,web-09:deploy@10.0.1.19,web-10:deploy@10.0.1.20,web-11:deploy@10.0.1.21,web-12:deploy@10.0.1.22"
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target "control" local:
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[prepare release bundle]:
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skip if $ test -f /tmp/cgr-pages-demo/releases/myapp-${release_id}.tar.gz
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run $ mkdir -p /tmp/cgr-pages-demo/releases && printf "myapp %s\n" "${release_id}" > /tmp/cgr-pages-demo/releases/myapp-${release_id}.tar.gz
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[build release]:
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parallel 3 at a time, if one fails stop all:
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[render nginx template]:
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run $ mkdir -p /tmp/cgr-pages-demo/build && printf "server template %s\n" "${release_id}" > /tmp/cgr-pages-demo/build/nginx.conf
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[smoke test release]:
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first [prepare release bundle]
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run $ test -s /tmp/cgr-pages-demo/releases/myapp-${release_id}.tar.gz
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[compile static assets]:
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run $ mkdir -p /tmp/cgr-pages-demo/build && printf "assets %s\n" "${release_id}" > /tmp/cgr-pages-demo/build/assets.txt
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[write release notes]:
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run $ mkdir -p /tmp/cgr-pages-demo/build && printf "release %s\n" "${release_id}" > /tmp/cgr-pages-demo/build/notes.txt
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run $ tar -czf /tmp/cgr-pages-demo/myapp-${release_id}.tar.gz -C /tmp/cgr-pages-demo/build .
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[choose artifact mirror]:
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first [build release]
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race:
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[mirror us-east]:
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run $ printf "us-east\n" > /tmp/cgr-pages-demo/mirror.txt
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[mirror us-west]:
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run $ printf "us-west\n" > /tmp/cgr-pages-demo/mirror.txt
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[mirror eu-central]:
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run $ printf "eu-central\n" > /tmp/cgr-pages-demo/mirror.txt
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[preload release to fleet]:
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first [choose artifact mirror]
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each server in ${web_names}, 4 at a time:
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[preload ${server}]:
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run $ printf "preloaded ${release_id} for ${server}\n" >> /tmp/cgr-pages-demo/preload.log
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[shift traffic]:
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first [preload release to fleet]
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stage "traffic shift":
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phase "canary" 1 from ${web_names}:
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[enable ${server} in load balancer]:
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run $ printf "enabled canary ${server}\n" >> /tmp/cgr-pages-demo/lb.log
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verify "canary ${server} healthy":
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run $ printf "healthy ${server}\n"
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retry 3x wait 2s
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phase "half" 50% from ${web_names}:
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each server, 3 at a time:
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[enable ${server} in load balancer]:
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run $ printf "enabled half ${server}\n" >> /tmp/cgr-pages-demo/lb.log
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phase "remaining" rest from ${web_names}:
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each server, 6 at a time:
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[enable ${server} in load balancer]:
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run $ printf "enabled remaining ${server}\n" >> /tmp/cgr-pages-demo/lb.log
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each name, addr in ${web_hosts}:
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target "${name}" ssh ${addr}:
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[install nginx] as root:
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first [control/smoke test release]
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first [control/choose artifact mirror]
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skip if $ command -v nginx
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run $ apt-get update && apt-get install -y nginx
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[write site config] as root:
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[configure and stage ${name}]:
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first [install nginx]
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content > /etc/nginx/sites-available/myapp:
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server {
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listen 80;
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server_name ${name}.example.com;
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root /var/www/myapp;
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index index.html;
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location / { try_files $uri $uri/ =404; }
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}
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validate $ nginx -t
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[enable site] as root:
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first [write site config]
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skip if $ test -L /etc/nginx/sites-enabled/myapp
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run $ ln -sf /etc/nginx/sites-available/myapp /etc/nginx/sites-enabled/myapp
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[deploy code]:
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first [install nginx]
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skip if $ test -f /var/www/myapp/releases/${release_id}/index.html
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run $ mkdir -p /var/www/myapp/releases/${release_id} && printf '<h1>Hello from ${name}</h1>\n' > /var/www/myapp/releases/${release_id}/index.html
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parallel, if one fails wait for rest:
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[write site config] as root:
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content > /etc/nginx/sites-available/myapp:
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server {
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listen 80;
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server_name ${name}.example.com;
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root /var/www/myapp/current;
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index index.html;
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location / { try_files $uri $uri/ =404; }
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}
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validate $ nginx -t
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[deploy code]:
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skip if $ test -f /var/www/myapp/releases/${release_id}/index.html
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run $ mkdir -p /var/www/myapp/releases/${release_id} && printf '<h1>Hello from ${name}</h1>\n' > /var/www/myapp/releases/${release_id}/index.html
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[write health endpoint]:
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run $ mkdir -p /var/www/myapp/releases/${release_id} && printf 'ok ${name}\n' > /var/www/myapp/releases/${release_id}/health.txt
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[activate release] as root:
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first [deploy code]
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first [configure and stage ${name}]
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run $ ln -sfn /var/www/myapp/releases/${release_id} /var/www/myapp/current
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[start nginx] as root:
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first [enable site], [activate release]
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first [activate release]
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skip if $ systemctl is-active nginx
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run $ systemctl reload-or-restart nginx
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verify "site is live on ${name}":
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first [start nginx]
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first [start nginx], [control/shift traffic]
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run $ curl -sf http://localhost/
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retry 3x wait 2s
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