update

install/app.md

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+Install Golang (https://golang.org/dl/).
+```
+wget https://dl.google.com/go/go1.14.1.linux-amd64.tar.gz
+tar -xf go1.14.1.linux-amd64.tar.gz
+ln -s /usr/local/go/bin/go /usr/local/bin/
+ln -s /usr/local/go/bin/gofmt /usr/local/bin/
+go version
+```
+
+Add user and service.
+```
+# adduser --disabled-login stat
+# nano /etc/systemd/system/app.service
+[Unit]
+Description=Stat Daemon
+After=network.target manticore.service
+
+[Service]
+LimitNOFILE=65535
+Type=simple
+GuessMainPID=no
+ExecStart=/home/stat/go/app/app
+Restart=always
+User=stat
+StandardOutput=syslog
+StandardError=syslog
+
+[Install]
+WantedBy=multi-user.target
+
+# systemctl daemon-reload
+# systemctl enable app
+```
+
+Build app.
+```
+su stat
+mkdir ~/go
+cd ~/go
+go get github.com/gorilla/websocket
+go get github.com/go-sql-driver/mysql
+go get github.com/jmoiron/sqlx
+cd app
+go build -ldflags "-s -w"
+```
+
+Start service.
+```
+exit
+systemctl start app
+systemctl status app
+```