Run.d: allow hooks for processes during container start

README.md

@@ -7,3 +7,9 @@ Variable | Example | Description
 `SERVER_MAX_BODY_SIZE` | `SERVER_MAX_BODY_SIZE=4M` | Allows the downstream application to specify a non-default `client_max_body_size` configuration for the `server`-level directive in `/etc/nginx/sites-available/default`
 `SERVER_INDEX` | `SERVER_INDEX index.html index.html index.php` | Changes the default pages to hit for folder and web roots
 `SERVER_APP_NAME` | `APP_NAME='view'` | Sets a kv pair to be consumed by logging service for easy parsing and searching
+
+
+### Runtime Commands
+
+To inject things into the runtime process, add shell scripts (ending in .sh) into the
+`/run.d` folder. These will be executed during container start.

container/root/run.d/10-nginx.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+CONFIG_SITE=/etc/nginx/sites-available/default
+CONFIG_SERVER=/etc/nginx/nginx.conf
+
+echo '[nginx] setting sensible defaults'
+
+# Configure nginx to use as many workers as there are cores for the running container
+sed -i "s/worker_processes [0-9]\+/worker_processes $(nproc)/" $CONFIG_SERVER
+sed -i "s/worker_connections [0-9]\+/worker_connections 1024/" $CONFIG_SERVER
+
+echo '[nginx] piping logs to STDOUT'
+# Ensure nginx is configured to write logs to STDOUT
+# Also set log_format to output SERVER_APP_NAME placeholder
+sed -i "s/access_log [a-z\/\.\;]\+/            log_format main \'\$remote_addr - \$remote_user [\$time_local] \"\$request\" \$status \$bytes_sent \"\$http_referer\" \"\$http_user_agent\" ${SERVER_APP_NAME}\';\n        access_log \/dev\/stdout main;\n/" $CONFIG_SERVER
+sed -i "s/error_log [a-z\/\.\ \;]\+/error_log \/dev\/stdout info;/" $CONFIG_SERVER
+
+if [[ $SERVER_MAX_BODY_SIZE ]]
+then
+  echo "[nginx] server client max body is ${SERVER_MAX_BODY_SIZE}"
+  sed -i "s/client_max_body_size 1m/client_max_body_size ${SERVER_MAX_BODY_SIZE}/" $CONFIG_SITE
+fi
+
+if [[ $SERVER_INDEX ]]
+then
+  echo "[nginx] server index is ${SERVER_INDEX}"
+  sed -i "s/index index.html index.htm/index ${SERVER_INDEX}/" $CONFIG_SITE
+fi

container/root/run.d/README

@@ -0,0 +1,6 @@
+### Runtime commands
+---
+
+Allows children to inject things into the run process.
+
+Drop bash scripts in here to be executed by entrypoint during startup.

container/root/run.sh

@@ -1,30 +1,11 @@
 #!/bin/bash
-CONFIG_SITE=/etc/nginx/sites-available/default
-CONFIG_SERVER=/etc/nginx/nginx.conf
+RUN_SCRIPTS=/run.d
 
-echo '[nginx] setting sensible defaults'
-
-# Configure nginx to use as many workers as there are cores for the running container
-sed -i "s/worker_processes [0-9]\+/worker_processes $(nproc)/" $CONFIG_SERVER
-sed -i "s/worker_connections [0-9]\+/worker_connections 1024/" $CONFIG_SERVER
-
-echo '[nginx] piping logs to STDOUT'
-# Ensure nginx is configured to write logs to STDOUT 
-# Also set log_format to output SERVER_APP_NAME placeholder 
-sed -i "s/access_log [a-z\/\.\;]\+/            log_format main \'\$remote_addr - \$remote_user [\$time_local] \"\$request\" \$status \$bytes_sent \"\$http_referer\" \"\$http_user_agent\" ${SERVER_APP_NAME}\';\n        access_log \/dev\/stdout main;\n/" $CONFIG_SERVER
-sed -i "s/error_log [a-z\/\.\ \;]\+/error_log \/dev\/stdout info;/" $CONFIG_SERVER
-
-if [[ $SERVER_MAX_BODY_SIZE ]]
-then
-  echo "[nginx] server client max body is ${SERVER_MAX_BODY_SIZE}"
-  sed -i "s/client_max_body_size 1m/client_max_body_size ${SERVER_MAX_BODY_SIZE}/" $CONFIG_SITE
-fi
-
-if [[ $SERVER_INDEX ]]
-then
-  echo "[nginx] server index is ${SERVER_INDEX}"
-  sed -i "s/index index.html index.htm/index ${SERVER_INDEX}/" $CONFIG_SITE
-fi
+# Run shell scripts (ending in .sh) in run.d directory, if any
+for file in $RUN_SCRIPTS/*.sh; do
+  echo "[run.d] executing ${file}"
+  /bin/bash $file
+done
 
 echo "[nginx] starting (foreground)"
 exec /usr/sbin/nginx -g "daemon off;"