Merge pull request #16919 from overleaf/jpa-check-env-vars

[server-ce] add script for checking on old ShareLaTeX env vars

GitOrigin-RevId: a60d6f7648d65c336054795affe91a349aa629cf

server-ce/init_scripts/200_nginx_config_template.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+set -e
+
+## Generate nginx config files from templates,
+## with environment variables substituted
+
+nginx_dir='/etc/nginx'
+nginx_templates_dir="${nginx_dir}/templates"
+
+if ! [ -d "${nginx_templates_dir}" ]; then
+  echo "Nginx: no template directory found, skipping"
+  exit 0
+fi
+
+nginx_template_file="${nginx_templates_dir}/nginx.conf.template"
+nginx_config_file="${nginx_dir}/nginx.conf"
+
+if [ -f "${nginx_template_file}" ]; then
+  export NGINX_KEEPALIVE_TIMEOUT="${NGINX_KEEPALIVE_TIMEOUT:-65}"
+  export NGINX_WORKER_CONNECTIONS="${NGINX_WORKER_CONNECTIONS:-768}"
+  export NGINX_WORKER_PROCESSES="${NGINX_WORKER_PROCESSES:-4}"
+
+  echo "Nginx: generating config file from template"
+
+  # Note the single-quotes, they are important.
+  # This is a pass-list of env-vars that envsubst
+  # should operate on.
+  envsubst '
+    ${NGINX_KEEPALIVE_TIMEOUT}
+    ${NGINX_WORKER_CONNECTIONS}
+    ${NGINX_WORKER_PROCESSES}
+  ' \
+    < "${nginx_template_file}" \
+    > "${nginx_config_file}"
+
+  echo "Nginx: reloading config"
+  service nginx reload
+fi