How to run nodejs and nginx with dyanmic Docker Option? - docker

Question

I'm fairly new to node and nginx. I've a task of building a simple webserver which host dynamic contents. A very crucial part of the webserver is to take inputs from user about ports to be used , any custom domain to be used (in place of localhost) , SSL certificates etc. from installer [Its supposed to be built for docker ] but I have no idea how to execute a script such that is passes the variable entered by user ( like $SERVER_URI) to nginx.conf and node file and overwrite current data

Answer 1

I will suggest to create a config file and read the value from them so everything will be dynamic.
Here is how you can achieve SSL certificate and other ENV and port dynamically also docker name and image name will be get and set.
Create file docker.config which contain ports, ENV, path mapping, hosts values and links if you wish to link container. leave them blank
if you do not need them. remove host_port:container_port this entry
just for comment purpose.
docker.config
START_PORT_MAPPINGS
host_port:container_port
8080:80
END_PORT_MAPPINGS
START_PATH_MAPPINGS
/path_to_code/:/var/www/htlm/test
/path_to_nginx_config1:/etc/nginx/nginx.conf
/path_to_ssl_certs:/container_path_to_Certs
END_PATH_MAPPINGS
START_LINKING
db:db-server
END_LINKING
START_HOST_MAPPINGS
test.com:192.168.1.23
test2.com:192.168.1.23
END_HOST_MAPPINGS
START_ENV_VARS
MYSQL_ROOT_PASSWORD=1234
OTHER_ENV_VAR=value
END_ENV_VARS
create start.sh this will read the values from docker.config and will run command your docker container.
Need two arguments 1st: docker name and 2nd: image name.
function read_connfig() {
docker_name="${1}"
input="docker.config"
option_key=$(echo "${2}" | cut -d':' -f1)
config_name=$(echo "${2}" | cut -d':' -f2)
post_fix=$(echo "${2}" | cut -d':' -f3)
while IFS=$' \t\n\r' read -r line; do
if [[ $line == END_"${config_name}" ]] ; then
read_prop="no"
fi
if [[ $read_prop == "yes" ]] ; then
echo -n "${option_key}${line}${post_fix} "
fi
if [[ $line == START_"${config_name}" ]] ; then
read_prop="yes"
fi
done < "$input"
}
function get_run_configs() {
docker_name=${1}
declare -a configs=("-p :PORT_MAPPINGS:" "-v :PATH_MAPPINGS:" "--add-host=:HOST_MAPPINGS:" "-e :ENV_VARS:" "--link :LINKING:")
local run_command=""
for config in "${configs[#]}"
do
config_vals=($(read_connfig "${docker_name}" "${config}"))
if [ ! -z "${config_vals}" ];
then
for config_val in "${config_vals[#]}"
do
run_command="${run_command} ${config_val}"
done
else
echo >&2 "No config found for ${config}"
fi
done
echo "${run_command}"
}
container_name=$1;
image_name=$2
docker_command=$(get_run_configs $docker_name)
echo $docker_command
docker run --name $container_name $docker_command -dit $image_name
Resulting command will be. ./start.sh test test
docker run --name test -p host_port:container_port -p 8080:80 -v /path_to_code/:/var/www/htlm/test -v /path_to_nginx_config1:/etc/nginx/nginx.conf -v /path_to_ssl_certs:/container_path_to_Certs --add-host=test.com:192.168.1.23 --add-host=test2.com:192.168.1.23 -e MYSQL_ROOT_PASSWORD=1234 -e OTHER_ENV_VAR=value --link db:db-server -dit test