sudo -s
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg|apt-key add -
echo "deb http://build.openvpn.net/debian/openvpn/<version> <osrelease> main" > /etc/apt/sources.list.d/openvpn-aptrepo.list
echo "deb http://build.openvpn.net/debian/openvpn/stable xenial main" > /etc/apt/sources.list.d/openvpn-aptrepo.list
apt-get update && apt-get install openvpn
References
https://community.openvpn.net/openvpn/wiki/OpenvpnSoftwareRepos
sudo nano /etc/sysctl.d/99-sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1
sudo sysctl -p
References
https://www.linuxbabe.com/ubuntu/disable-ipv6-on-ubuntu
https://askubuntu.com/questions/440649/how-to-disable-ipv6-in-ubuntu-14-04
https://support.purevpn.com/how-to-disable-ipv6-linuxubuntu
https://xxx.xxx.xxx.xxx:943/admin https://xxx.xxx.xxx.xxx:943/
References
https://openvpn.net/index.php/access-server/overview.html
https://www.loganmarchione.com/2015/08/setup-openvpn-access-server-on-ubuntu-server/
nano /etc/sysctl.conf
fs.file-max = 999999 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 4096 16777216 net.ipv4.tcp_wmem = 4096 4096 16777216 net.ipv4.tcp_syncookies = 1 # this gives the kernel more memory for tcp # which you need with many (100k+) open socket connections net.ipv4.tcp_mem = 50576 64768 98152 net.core.netdev_max_backlog = 2500
nano /etc/security/limits.conf
* soft nofile 262144 * hard nofile 262144 * soft nproc 262144 * hard nproc 262144
cat /proc/sys/net/ipv4/ip_local_port_range
cat /proc/sys/kernel/threads-max
nano .bashrc
ulimit -t unlimited ulimit -c unlimited
ulimit -a
References
https://lists.launchpad.net/mosquitto-users/msg00163.html
crontab -e
@reboot /path/to/script
References
https://askubuntu.com/questions/814/how-to-run-scripts-on-start-up
You could try adding this to your shell profile export _JAVA_OPTIONS=-Xmx2048m to assign more memory to Java by defualt
References
https://stackoverflow.com/questions/6064112/how-to-set-default-maximum-heap-size-for-java-xmx-for-linux-centos
https://askubuntu.com/questions/542585/how-to-increase-java-heap-size
First install SDKMAN
curl -s "https://get.sdkman.io" | bash source "$HOME/.sdkman/bin/sdkman-init.sh"
Install Gradle
sdk install gradle
References
http://sdkman.io/install.html
https://gradle.org/install/
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java9-installer
if you want to set Oracle Java 9 as default
sudo apt-get install oracle-java9-set-default
If you don’t want to make Oracle Java 9 default
sudo apt-get install --no-install-recommends oracle-java9-installer
References
http://www.webupd8.org/2015/02/install-oracle-java-9-in-ubuntu-linux.html
sudo apt-get install software-properties-common -y sudo add-apt-repository ppa:max-c-lv/shadowsocks-libev sudo apt-get update sudo apt install shadowsocks-libev
Configure and start the service
# Edit the configuration file sudo vim /etc/shadowsocks-libev/config.json # Edit the default configuration for debian sudo vim /etc/default/shadowsocks-libev # Start the service sudo /etc/init.d/shadowsocks-libev start # for sysvinit, or sudo systemctl start shadowsocks-libev # for systemd sudo systemctl enable shadowsocks-libev