Change Default Java Environment on Arch Linux
archlinux-java status
archlinux-java set <JAVA_ENV_NAME> archlinux-java set java-8-openjdk/jre
References
https://wiki.archlinux.org/index.php/Java
archlinux-java status
archlinux-java set <JAVA_ENV_NAME> archlinux-java set java-8-openjdk/jre
References
https://wiki.archlinux.org/index.php/Java
git config --global merge.tool meld
git config --global diff.tool meld
or edit ~/.gitconfig
References
https://git-scm.com/book/en/v2/Customizing-Git-Git-Configuration
http://stackoverflow.com/questions/6412516/configuring-diff-tool-with-gitconfig
http://stackoverflow.com/questions/34119866/setting-up-and-using-meld-as-your-git-difftool-and-mergetool
add these lines to /etc/sysctl.conf :
# max open files fs.file-max = 51200 # max read buffer net.core.rmem_max = 67108864 # max write buffer net.core.wmem_max = 67108864 # default read buffer net.core.rmem_default = 65536 # default write buffer net.core.wmem_default = 65536 # max processor input queue net.core.netdev_max_backlog = 250000 # max backlog net.core.somaxconn = 4096 # resist SYN flood attacks net.ipv4.tcp_syncookies = 1 # reuse timewait sockets when safe net.ipv4.tcp_tw_reuse = 1 # turn off fast timewait sockets recycling # net.ipv4.tcp_tw_recycle = 0 # short FIN timeout net.ipv4.tcp_fin_timeout = 30 # short keepalive time net.ipv4.tcp_keepalive_time = 1200 # outbound port range net.ipv4.ip_local_port_range = 10000 65000 # max SYN backlog net.ipv4.tcp_max_syn_backlog = 8192 # max timewait sockets held by system simultaneously net.ipv4.tcp_max_tw_buckets = 5000 # turn on TCP Fast Open on both client and server side net.ipv4.tcp_fastopen = 3 # TCP receive buffer net.ipv4.tcp_rmem = 4096 87380 67108864 # TCP write buffer net.ipv4.tcp_wmem = 4096 65536 67108864 # turn on path MTU discovery net.ipv4.tcp_mtu_probing = 1 net.ipv4.tcp_timestamps=1 net.ipv4.ip_no_pmtu_disc = 1 net.ipv4.tcp_mem = 25600 51200 102400 net.ipv4.ip_default_ttl=129
sysctl -p /etc/sysctl.conf
References
https://shadowsocks.org/en/config/advanced.html
https://linode.com/docs/networking/vpn/create-a-socks5-proxy-server-with-shadowsocks-on-ubuntu-and-centos7/
https://maxlv.net/optimize-a-shadowsocks-server/
add these lines to /etc/sysctl.conf :
fs.file-max = 100000 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_syncookies = 1 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.core.rmem_default=65536 net.core.wmem_default=65536 net.ipv4.route.flush=1
and then :
sysctl -p /etc/sysctl.conf
References
http://www.techrepublic.com/blog/linux-and-open-source/tuning-the-linux-kernel-for-more-aggressive-network-throughput/
https://wwwx.cs.unc.edu/~sparkst/howto/network_tuning.php
https://access.redhat.com/documentation/en-US/JBoss_Enterprise_Web_Platform/5/html/Administration_And_Configuration_Guide/jgroups-perf-udpbuffer.html
http://www.nateware.com/linux-network-tuning-for-2013.html
http://www.slashroot.in/linux-network-tcp-performance-tuning-sysctl
sudo apt-get install ffmpeg imagemagick
ffmpeg -t <duration> -ss <starting position in hh:mm:ss format> -i <input_video> out%04d.gif
ffmpeg -ss 00:00:02 -t 14 -i 02.mp4 02.gif
References
http://askubuntu.com/questions/648603/create-animated-gif-from-mp4-video-via-command-line
http://xmodulo.com/convert-video-animated-gif-image-linux.html
/tomcat/bin/startup.sh
/tomcat/bin/shutdown.sh
References
https://wolfpaulus.com/java/tomcat-jessie/
You have no configuration for swap in /etc/fstab . Add following line to that file:
UUID=<uuid> none swap sw 0 0
You have to replace
$ sudo blkid /dev/sda1: LABEL="System Reserved" UUID="88A0D0A1A0D09752" TYPE="ntfs" /dev/sda2: UUID="0620D9F920D9EFA3" TYPE="ntfs" /dev/sda5: UUID="c282b418-2045-4852-8789-88a44360a0bb" TYPE="ext4" /dev/sda6: UUID="f99c6a0c-790a-45ca-a1a9-8874f5a2999b" TYPE="ext4" /dev/sda7: UUID="4cc2e909-ebd1-4c72-abee-aa32035bf330" TYPE="swap"
References
http://askubuntu.com/questions/194775/swap-not-available-i-must-manually-swapon-after-every-reboot
sudo add-apt-repository ppa:yannubuntu/boot-repair sudo apt-get update sudo apt-get install -y boot-repair && boot-repair
sudo apt-get install python-letsencrypt-apache
letsencrypt --apache
nano /etc/apache2/apache2.conf
<VirtualHost *:443> SSLEngine on SSLCertificateKeyFile /etc/letsencrypt/live/dl.mhdr.ir/privkey.pem SSLCertificateFile /etc/letsencrypt/live/dl.mhdr.ir/cert.pem SSLCertificateChainFile /etc/letsencrypt/live/dl.mhdr.ir/chain.pem DocumentRoot "/var/www/html/dl" ServerName dl.mhdr.ir </VirtualHost>
service apache2 restart
PPA
$ sudo add-apt-repository ppa:certbot/certbot $ sudo apt-get update $ sudo apt-get install python-certbot-apache
note : only the last VitualHost will be detected by letsencrypt
References
https://certbot.eff.org/#ubuntuxenial-apache
https://www.digitalocean.com/community/tutorials/how-to-use-apache-http-server-as-reverse-proxy-using-mod_proxy-extension
https://letsencrypt.org/
ssh-keygen -t rsa -C "GitLab" -b 4096
copy the public key
xclip -sel clip < ~/.ssh/id_rsa.pub