## swap file
```
cd /var
touch swap.img
chmod 600 swap.img
dd if=/dev/zero of=/var/swap.img count=2048 bs=1M
mkswap swap.img
swapon swap.img
```

## Nginx conf
```
##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# https://www.nginx.com/resources/wiki/start/
# https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/
# https://wiki.debian.org/Nginx/DirectoryStructure
#
# In most cases, administrators will remove this file from sites-enabled/ and
# leave it as reference inside of sites-available where it will continue to be
# updated by the nginx packaging team.
#
# This file will automatically load configuration files provided by other
# applications, such as Drupal or Wordpress. These applications will be made
# available underneath a path with that package name, such as /drupal8.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##

# Default server configuration
#
server {
	server_tokens off;
	charset utf-8;

	# SSL configuration
	#
	# listen 443 ssl default_server;
	# listen [::]:443 ssl default_server;
	#
	# Note: You should disable gzip for SSL traffic.
	# See: https://bugs.debian.org/773332
	#
	# Read up on ssl_ciphers to ensure a secure configuration.
	# See: https://bugs.debian.org/765782
	#
	# Self signed certs generated by the ssl-cert package
	# Don't use them in a production server!
	#
	# include snippets/snakeoil.conf;

	root /var/www/html;

	# Add index.php to the list if you are using PHP
	index index.html index.htm;

	server_name luyanxin.com www.luyanxin.com;

	location / {
		# First attempt to serve request as file, then
		# as directory, then fall back to displaying a 404.
		try_files $uri $uri/ =404;
	}

	location /sync/gonggong/books {
		# use this one if we access files from nginx
		autoindex on;
	#

		# for using droppy
		# rewrite	log	on;
		# rewrite	^/sync$	/sync/ redirect;
		# rewrite /sync(.*)	$1 break;
		# proxy_pass http://localhost:8989;
		# proxy_redirect		off;
		# proxy_set_header	Host	$host;
		# proxy_set_header	X-Real-IP	$remote_addr;
		# proxy_set_header	X-Forwarded-For	$remote_addr;
	}

	location /syncthing {
		# syncthing settings
		rewrite	log	on;
		rewrite	^/syncthing$	/syncthing/ redirect;
		rewrite /syncthing(.*)	$1 break;
		proxy_pass http://127.0.0.1:8384;
		# proxy_redirect		off;
		# proxy_set_header	Host	$host;
		# proxy_set_header	X-Real-IP	$remote_addr;
		# proxy_set_header	X-Forwarded-For	$remote_addr;
	}

	# pass PHP scripts to FastCGI server
	#
	location ~ \.php$ {
		include snippets/fastcgi-php.conf;

		# With php-fpm (or other unix sockets):
		fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
	#	# With php-cgi (or other tcp sockets):
	#	fastcgi_pass 127.0.0.1:9000;
	}

	# deny access to .htaccess files, if Apache's document root
	# concurs with nginx's one
	#
	#location ~ /\.ht {
	#	deny all;
	#}

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/luyanxin.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/luyanxin.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


}


# Virtual Host configuration for example.com
#
# You can move that to a different file under sites-available/ and symlink that
# to sites-enabled/ to enable it.
#
#server {
#	listen 80;
#	listen [::]:80;
#
#	server_name example.com;
#
#	root /var/www/example.com;
#	index index.html;
#
#	location / {
#		try_files $uri $uri/ =404;
#	}
#}

server {
    if ($host = www.luyanxin.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = luyanxin.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


	listen 80 default_server;
	listen [::]:80 default_server;

	server_name luyanxin.com www.luyanxin.com;
    return 404; # managed by Certbot
```
## 基本命令

```shell
# bring docker container up
docker-compose up

# Stop services only
docker-compose stop

# Stop and remove containers, networks..
docker-compose down 

# Down and remove volumes
docker-compose down --volumes 

# Down and remove images
docker-compose down --rmi <all|local> 

# check docker resources usage
docker stats
```
## 开机后要运行的程序

```shell
# monitoring
# https://glances.readthedocs.io/en/latest/index.html
glances

# https://github.com/pldubouilh/gossa
cd ~/softwares/gossa
docker-compose up

# https://docs.syncthing.net/intro/getting-started.html
cd ~/softwares/syncthing
docker-compose up

# https://miniflux.app/index.html
cd ~/softwares/miniflux
docker compose up

# https://docs.gitea.com/installation/install-with-docker-rootless
cd ~/softwares/gitea
docker-compose up

# https://shaarli.readthedocs.io/en/master/Docker.html
cd ~/softwares/shaarli
sh docker-up.sh
```