https://wiki.felixc.at/ 2026-04-17T18:03:49+00:00 https://wiki.felixc.at/ https://wiki.felixc.at/_media/wiki:dokuwiki.svg text/html 2017-01-05T06:57:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/aboutme?rev=1483599420&do=diff FelixYan text/html 2017-01-06T02:38:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/badvpn?rev=1483670327&do=diff Supervisor Conf with Docker cat > /etc/supervisor/conf.d/badvpn-udpgw.conf <<EOF [program:badvpn-udpgw] command = /usr/bin/docker run --rm --name badvpn-udpgw --net=host felixonmars/archlinux badvpn-udpgw --listen-addr 127.0.0.1:7300 EOF supervisorctl update text/html 2017-01-05T06:04:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/dnsmasq?rev=1483596283&do=diff DNS Server no-resolv no-poll conf-dir=/etc/dnsmasq.d server=8.8.4.4 server=8.8.8.8 DHCP Server dhcp-range=192.168.0.100,192.168.0.200,12h dhcp-option=option:router,192.168.0.1 dhcp-option=option:dns-server,192.168.0.1 DHCP Whitelist dhcp-ignore=net:!whitelist dhcp-host=<MAC-ADDRESS>,net:whitelist text/html 2017-01-05T06:56:32+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/dropquest2012?rev=1483599392&do=diff 1. 64529 from scipy.optimize import fsolve from math import sin,cos def f(x): a = float(x[0]) b = float(x[1]) c = float(x[2]) d = float(x[3]) e = float(x[4]) return [ a*b-24, 2*d-b, d+e-a-c, a+b+c+d+e-26, b+c-e, ] result = fsolve(f, [1,1,1,1,1]) print result print f(result) text/html 2017-01-06T08:03:44+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/fcitx?rev=1483689824&do=diff Use regular session dbus FCITX_NO_PRIVATE_DBUS=1 text/html 2017-01-05T07:39:23+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/felixyan_badges?rev=1483601963&do=diff <https://www.openhub.net/accounts/230215?ref=Detailed> [Stack Overflow] [Stack Exchange] [BOINC] [HE IPv6] text/html 2017-01-05T07:40:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/felixyan_boinc?rev=1483602046&do=diff [BOINC] [BOINC] [BOINC] text/html 2017-01-05T07:06:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/felixyan_osu?rev=1483599987&do=diff <https://osu.ppy.sh/u/762884> [OSU!] text/html 2025-01-18T16:01:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/felixyan_privatetrackers?rev=1737216107&do=diff U2 CMCT TTG 皇后 葡萄 HDCity Redacted LzTr HDBits IPT TorrentLeech KeepFRDS Jpopsuki BakaBT HD-Torrents animebytes HDSky JoyHD HDR BYRBT TLFBits DIC Inactive OurDisc TCCF HDChina M-Team Dead CHD 六维空间 PianoSheets HDWinG SeeHD What.cd HDArea 神站 mutracker 清影PT 点击扑通 G. Waffles.ch 麦田PT AsianDVDClub 天天高清 CCFBits text/html 2017-01-05T06:57:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/felixyan?rev=1483599429&do=diff sidebar text/html 2017-01-05T06:48:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/iptables_packetflow?rev=1483598938&do=diff text/html 2017-01-05T06:35:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/knowledgebase?rev=1483598114&do=diff start text/html 2017-01-05T06:39:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/linux_network_ppp?rev=1483598344&do=diff /etc/ppp/ip-up.d/01-iprule.sh ip rule add from $4 lookup $1 ip route add table $1 default dev $1 /etc/ppp/ip-up.d/02-route.sh ip route add default via $5 || true Fix MTU iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu text/html 2018-11-07T16:34:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/linux_network?rev=1541608460&do=diff IPv6 Tunnelbroker with systemd-networkd # cat > /etc/systemd/network/he-tunnel.netdev << EOF [Match] [NetDev] Name=he-ipv6 Kind=sit MTUBytes=1480 [Tunnel] Local=<your_ip_address> Remote=<tunnelbroker_endpoint> TTL=255 EOF # cat > /etc/systemd/network/he-tunnel.network << EOF [Match] Name=he-ipv6 [Network] Address=2001:470:<yourprefix>::2/64 Gateway=2001:470:<yourprefix>::1 EOF # sed -i '/\[Network\]/aTunnel=he-ipv6' /etc/systemd/network/default.network text/html 2025-03-27T09:40:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/linux_risc-v?rev=1743068457&do=diff Live Replace cd / apt install wget zstd wget http://mirrors.cernet.edu.cn/archriscv/images/archriscv-latest.tar.zst mkdir oldroot newroot cd newroot tar xf ../archriscv-latest.tar.zst cd .. mv archriscv-latest.tar.zst bin etc home lib opt root sbin srv tmp usr var oldroot/ cd newroot LD_LIBRARY_PATH="$PWD"/lib "$PWD"/lib/ld-linux-riscv64-lp64d.so.1 "$PWD"/usr/bin/mv bin etc home lib opt root sbin srv tmp usr var ../ cd .. cp -r oldroot/lib/firmware lib/ cp -r oldroot/lib/modules/ lib/ cp … text/html 2024-05-12T15:16:21+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/linux_security?rev=1715526981&do=diff Reset Root Password Add this to your (grub's kernel line or grub2's linux line) and boot: init=/bin/bash Then just use passwd to reset the root password: passwd On old systems you may need to remount the filesystem: mount -o remount,rw / text/html 2024-05-13T17:38:30+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/linux?rev=1715621910&do=diff Create a Swap File _size=4g _location=/ fallocate -l $_size $_location/$_size.swap chmod 600 $_location/$_size.swap mkswap $_location/$_size.swap echo "$_location/$_size.swap none swap defaults 0 0" >> /etc/fstab swapon -a btrfs: btrfs filesystem mkswapfile -s $_size $_location/$_size.swap text/html 2017-01-05T06:02:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/locale?rev=1483596166&do=diff UTF-8 Environment for Ubuntu Server echo "en_US.UTF-8 UTF-8" > /var/lib/locales/supported.d/local locale-gen update-locale LANG=en_US.UTF-8 Note: For some VPS the last command does not work, you have to add this to ~/.bashrc or /etc/bash.bashrc too: text/html 2017-01-05T06:30:49+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/mariadb?rev=1483597849&do=diff Percona text/html 2017-01-06T07:47:12+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/mongodb?rev=1483688832&do=diff Authentication Add A User Administrator as Per Recommended by MongoDB $ mongo > db = db.getSiblingDB('admin') > db.createUser({user: "username", pwd: "password", roles: ["userAdminAnyDatabase"]}) Add A FULL PRIVILEGED User (to unlock full functionality of RockMongo, etc) text/html 2017-01-06T02:48:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/msmtp?rev=1483670890&do=diff Sample Configuration defaults auth on tls on tls_trust_file /etc/ssl/certs/ca-certificates.crt logfile /etc/msmtp/msmtp.log aliases /etc/aliases account sendgrid host smtp.sendgrid.net from noreply@your.domain port 587 user apikey password your.api.secret account default : sendgrid text/html 2017-01-05T06:31:21+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/mysql?rev=1483597881&do=diff Percona text/html 2017-01-05T06:21:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/nat?rev=1483597267&do=diff Enable IP Forwarding First sed -i 's/.*net\.ipv4\.ip_forward.*/net.ipv4.ip_forward = 1/' /etc/sysctl.conf sysctl -p NAT using iptables Recommended Way (If IP is static) iptables -t nat -A POSTROUTING -s 10.0.0.0/8 -j SNAT --to-source <IP> Another Way (OpenVZ won't work this way) text/html 2017-01-05T06:10:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/nginx_ssl?rev=1483596646&do=diff Make A Self-signed SSL certificate cd /etc/nginx openssl req -new -x509 -nodes -out server.crt -keyout server.key chmod 600 server.key Global Settings ssl_protocols TLSv1.2 TLSv1.1 TLSv1; ssl_prefer_server_ciphers on; ssl_ciphers "EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 EECDH+aRSA+RC4 EECDH EDH+aRSA RC4 !aNULL !eNULL !LOW !3DES !MD5 !EXP !PSK !SRP !DSS !RC4"; text/html 2017-01-05T06:07:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/nginx?rev=1483596476&do=diff Installation on Ubuntu Server apt install -y software-properties-common add-apt-repository -y ppa:nginx/stable apt update && apt install nginx -y Installation on Debian Server wget http://www.dotdeb.org/dotdeb.gpg -O - | apt-key add - tee /etc/apt/sources.list.d/dotdeb.list << EOF deb http://mirror.us.leaseweb.net/dotdeb/ wheezy all deb-src http://mirror.us.leaseweb.net/dotdeb/ wheezy all EOF apt update && apt install nginx -y text/html 2017-01-05T06:19:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/openvpn?rev=1483597197&do=diff Installation on Ubuntu Server apt-get install openvpn Installation on Debian Server tee /etc/apt/sources.list.d/backports.list << EOF deb http://ftp.us.debian.org/debian wheezy-backports main EOF apt-get update; apt-get -t wheezy-backports install openvpn -y text/html 2019-08-25T04:01:25+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/percona?rev=1566705685&do=diff Installation on Ubuntu wget https://repo.percona.com/apt/percona-release_0.1-3.$(lsb_release -sc)_all.deb dpkg -i percona-release_0.1-3.$(lsb_release -sc)_all.deb apt-get update apt-get install percona-server-server-5.7 Create UTF-8 Database and User text/html 2017-01-05T06:15:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/php-fpm?rev=1483596908&do=diff PHP-FPM Installation on Ubuntu Server apt-get install software-properties-common add-apt-repository ppa:nginx/stable add-apt-repository ppa:ondrej/php apt-get update apt-get install nginx apt-get install php5.6-cgi php5.6-mysql php5.6-fpm php5.6-curl php5.6-gd php5.6-imap php5.6-mbstring php5.6-mcrypt php5.6-pspell php5.6-recode php5.6-sqlite php5.6-tidy php5.6-xmlrpc php5.6-xsl text/html 2017-01-06T02:50:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/php-uwsgi?rev=1483671007&do=diff Supervisor Conf cat > /etc/supervisor/conf.d/phpenv.conf <<EOF [program:phpenv] command = /usr/bin/docker run --rm --name phpenv -v /etc/php:/etc/php -v /etc/msmtp:/etc/msmtp -v /var/run/mysqld:/run/mysqld -v /var/www:/var/www --net=host felixonmars/archlinux uwsgi -s 127.0.0.1:3030 -b 32768 --plugin php -M -p 40 --cheaper 4 --uid 33 --gid 33 --php-sapi-name=apache --disable-logging stopsignal = QUIT EOF text/html 2017-01-05T06:31:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/php?rev=1483597903&do=diff PHP-FPM text/html 2017-01-05T06:46:44+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/pidgin?rev=1483598804&do=diff Debugging Pidgin Ignore SIGPIPE used by XMPP plugin handle SIGPIPE nostop noprint pass References: * <http://ahlamnote.blogspot.com/2006/12/gdb-ignore-sigpipe.html> text/html 2017-01-05T06:43:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/portforwarding?rev=1483598584&do=diff Port forwarding using iptables iptables -t nat -A PREROUTING -p tcp -m tcp --dport <port> -j DNAT --to-destination <host>:<port> text/html 2017-01-05T06:55:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/pythonchallenge?rev=1483599304&do=diff <http://www.pythonchallenge.com/> 0: * Change url from 0 to 1 * print 2**38 and put the result to url again 1: s = 'g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr\'q ufw rfgq rcvr gq qm jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc spj.' frm = ''.join([chr(c) for c in range(ord('a'),ord('z') + 1)]) to = frm[2:] + 'ab' print s.translate(string.maketrans(frm, to)) text/html 2017-01-05T06:53:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/regex.alf.nu?rev=1483599227&do=diff <http://regex.alf.nu/> Plain strings foo (207 points) Anchors k$ (208 points) Ranges ^[a-f]+$ (202 points) Backrefs (.{3}).*\1 (200 points) Abba ^(?!.*(.)(.)\2\1) (193 points) A man, a plan ^(.)(.).*?\2\1$ (175 points) Prime ^(?!(..+)(\1)+$) (284 points) text/html 2025-11-30T22:55:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/sidebar?rev=1764543356&do=diff About Me Felix Yan (@felixonmars) is a cat. Meow~ * Mastodon * Blog * GitHub * X(Twitter) * Steam * Facebook * AUR * Launchpad * LinkedIn Some badges: <https://www.openhub.net/accounts/230215?ref=Detailed> [Stack Overflow] * My Badges * My BOINC * My osu! text/html 2018-05-05T01:44:34+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/ssh?rev=1525484674&do=diff Trust host key without /dev/tty ssh -o StrictHostKeyChecking=no <username>@<server> SSHGuard iptables -A INPUT -m multiport -p tcp --destination-ports 22 -j sshguard iptables-save > /etc/iptables/iptables.rules SSH Tunnel Create New Tunnel Account text/html 2024-05-12T15:20:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/start?rev=1715527257&do=diff General * SSH * Linux/Security * Linux/RISC-V * Linux (Miscellaneous) Networking * PortForwarding * NAT * Dnsmasq * Linux/Network * Linux/Network/PPP Web Server * Nginx * Nginx/SSL Databases * Percona Email * MSMTP Materials * IPTables/PacketFlow Miscellaneous * regex.alf.nu * PythonChallenge * Dropquest2012 Old * PHP-FPM * Locale * OpenVPN * BadVPN * VB6/Recipes * Pidgin * Fcitx * Xorg * MongoDB * PHP-uWSGI text/html 2017-01-05T06:52:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/vb6_recipes?rev=1483599168&do=diff Hand Cursor (For Windows <= XP) API: Private Declare Function SetCursor Lib "user32" (ByVal hCursor As Long) As Long Add to `MouseMove`: If Button = 0 Then SetCursor 65581 Move Window By Object API: Private Declare Function ReleaseCapture Lib "user32" () As Long Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long Const WM_SYSCOMMAND = &HA1 Const SC_MOVE = 2 text/html 2017-01-05T06:46:07+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.felixc.at/xorg?rev=1483598767&do=diff Enable Mouse Wheel Emulation Automagically for ANY Mouse Edit the following section of `/etc/X11/xorg.conf.d/10-evdev.conf` Section "InputClass" Identifier "evdev pointer catchall" MatchIsPointer "on" MatchDevicePath "/dev/input/event*" Driver "evdev" Option "EmulateWheel" "true" Option "EmulateWheelButton" "2" Option "XAxisMapping" "6 7" Option "YAxisMapping" "4 5" EndSection