自动启动网卡 CENTOS安装完后，网卡默认没有激活，无法分配IP地址
/etc/sysconfig/network-scripts/ifcfg-enp0s3
DEVICE=enp0s3 BOOTPROTO=dhcp ONBOOT=yes systemctl restart network set the default route on interface
DEFROUTE="yes" 删除MariaDB rpm -qa | grep mariadb sudo yum remove -y mariadb mariadb-server rpm -qa | grep mariadb yum remove -y mariadb-libs-5.5.65-1.el7.x86_64 rm -rf /var/log/mariadb rm -f /var/log/mariadb/mariadb.log.rpmsave rm -rf /var/lib/mysql rm -rf /usr/lib64/mysql rm -rf /usr/share/mysql install
sudo yum install MariaDB-server sudo systemctl start mariadb.service 安装polipo git clone https://github.
之前一直用pycharm,今天把code升级到1.3.2的时候， 突然提示我安装python扩展，决定试试。 结果发现python的解释器设置有问题， 总是设置为系统的解释器， 而虚拟环境的解释器不起作用。
apt remove --purge python3.5 reboot 结果ubuntu桌面启动不了。好多应用程序例如chrome，virtualbox都消失了， 造成了很大的麻烦。
Ctrl+Alt+F1进入虚拟控制台登录
apt install python3.5 apt install ubuntu-desktop 重新安装chrome和virtualbox
cd /etc/apt/sources.list.d sudo mv google-chrome.list.save google-chrome.list apt update apt install google-chrome-stable
端到端VXLAN(unicast) ip a ip link add vxlan0 type vxlan \ id 42 \ dstport 4789 \ remote 10.12.0.172 \ local 10.12.2.95 \ dev eth0 ip -d link show dev vxlan0 ip addr add 192.168.8.101/24 dev vxlan0 ip link set vxlan0 up ip r default via 10.12.0.1 dev eth0 10.12.0.0/21 dev eth0 proto kernel scope link src 10.12.2.95 192.168.8.0/24 dev vxlan0 proto kernel scope link src 192.168.8.101 bridge fdb | grep vxlan0 ip neigh 多播vxlan(multicast)
putting /tmp on tmpfs https://blog.ubuntu.com/2016/01/20/data-driven-analysis-tmp-on-tmpfs
Interrupt Coalescence ubuntu 16 default
Interrupt Coalescence (IC)
$ethtool -c enp0s25 Coalesce parameters for enp0s25: Adaptive RX: off TX: off Pause frames
$ethtool -a enp0s25 Pause parameters for enp0s25: Autonegotiate: on RX: on TX: on network Tuning the network adapter (NIC)
use Jumbo frames
ifconfig eth0 mtu 9000 ip result for a healthy system with no packet drops
ip -s link show eth0 stop irqbalance for home user
常用命令 常用命令
bandwidth utilization tool wget -qO- https://github.com/imsnif/bandwhich/releases/download/${WHAT_VERSION}/bandwhich-v${WHAT_VERSION}-x86_64-unknown-linux-musl.tar.gz | tar xvz -C ~/bin/ bandwhich TCP tcpdump-windows
TCP DUMP
禁止启动时候恢复页面提示 Version 73.0.3683.86 (Official Build) (64-bit)
方法1（可靠） 首先关闭chrome，然后修改下面的设置，修改完后重启
.config/google-chrome/Default/Preferences
sed -i '/exit_type:Crashed/exit_type:Normal/` windows用户请参考下面的视频
Chrome Didn’t Shut Down Correctly Error Solved Windows 7
方法2（不可靠） Type in address bar (Crtl+L).
chrome://flags/#infinite-session-restore Click on the right drop-down menu and change the ‘Default’ value to ‘Disable’. Then restart Chrome to apply that setting
enter password to unlock your keyring 方法1（可靠）
set password-store to basic
dpkg -L google-chrome-stable |grep desktop | xargs cp {1} ~/.
标准设备 Bridge: A Linux bridge behaves like a network switch. It forwards packets between interfaces that are connected to it. It’s usually used for forwarding packets on routers, on gateways, or between VMs and network namespaces on a host. It also supports STP, VLAN filter, and multicast snooping. TUN: TUN (network Tunnel) devices work at the IP level or layer three level of the network stack and are usually point-to-point connections.
ssh client config ~/.ssh/config
host * StrictHostKeyChecking no Enables forwarding of the authentication agent connection client config .ssh/config
ForwardAgent yes Enable ssh-agent on main device
.bashrc
SSH_ENV="$HOME/.ssh/environment" function start_agent { echo "Initialising new SSH agent..." /usr/bin/ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}" echo succeeded chmod 600 "${SSH_ENV}" . "${SSH_ENV}" > /dev/null /usr/bin/ssh-add; } # Source SSH settings, if applicable if [ -f "${SSH_ENV}" ]; then .
tl;dr
uget https://osdn.net/projects/systemrescuecd/storage/releases/6.0.2/systemrescuecd-6.0.2.iso sudo mount -t tmpfs tmpfs /takeover/ sudo mount -o loop,ro -t iso9660 ~/systemrescuecd-6.0.2.iso /mnt/cd cp -rf /mnt/cd/* /takeover/ curl -L https://www.busybox.net/downloads/binaries/1.26.2-defconfig-multiarch/busybox-x86_64 > busybox chmod u+x /takeover/busybox git clone https://github.com/marcan/takeover.sh.git gcc takeover.sh/fakeinit.c -o ./fakeinit
/etc/default/locale
update-locale LANG=zh_CN.UTF-8 # File generated by update-locale LANG="en_US.UTF-8" LC_NUMERIC="zh_CN.UTF-8" LC_TIME="zh_CN.UTF-8" LC_MONETARY="zh_CN.UTF-8" LC_PAPER="zh_CN.UTF-8" LC_NAME="zh_CN.UTF-8" LC_ADDRESS="zh_CN.UTF-8" LC_TELEPHONE="zh_CN.UTF-8" LC_MEASUREMENT="zh_CN.UTF-8" LC_IDENTIFICATION="zh_CN.UTF-8" LANGUAGE="zh_CN:en_US:en"
iptables规则配置 表与链 调用链顺序 检查内存 ram speed and type
dmidecode
sudo dmidecode --type memory # dmidecode 3.0 Getting SMBIOS data from sysfs. SMBIOS 2.6 present. Handle 0x003E, DMI type 17, 28 bytes Memory Device Array Handle: 0x003C Error Information Handle: Not Provided Total Width: Unknown Data Width: Unknown Size: No Module Installed Form Factor: DIMM Set: 1 Locator: XMM1 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: Unknown Manufacturer: JEDEC ID: Serial Number: Asset Tag: Not Specified Part Number: Rank: Unknown lshw
dstat $dstat -d -nt $dstat -nt $dstat -N eth2,eth3 pkstat sudo apt-get install pktstat sudo pktstat -i eth0 -nt nethogs sudo apt-get install nethogs sudo nethogs EPEL http://www.cyberciti.biz/faq/fedora-sl-centos-redhat6-enable-epel-repo/
$ cd /tmp $ wget http://mirror-fpt-telecom.fpt.net/fedora/epel/6/i386/epel-release-6-8.noarch.rpm # rpm -ivh epel-release-6-8.noarch.rpm How do I use EPEL repo?
Simply use the yum commands to search or install packages from EPEL repo:
# yum search nethogs # yum update # yum --disablerepo="*" --enablerepo="epel" install nethogs System administrators responsible for handling Linux servers get confused at times when they are told to benchmark a file system’s performance.
push docker images to ali registry-mirrors https://cr.console.aliyun.com
#!/usr/bin/env bash docker login --username=wubigo registry.cn-beijing.aliyuncs.com docker images | grep v1.13 | awk '{ print $1 }' | sed --expression=s'/K8S.gcr.io\///' | xargs -i -t docker tag K8S.gcr.io/{}:v1.13.3 registry.cn-beijing.aliyuncs.com/co1/{}:v1.13.3 docker images |grep "registry.cn-beijing.aliyuncs.com"| awk '{ print $1 }'| sed --expression=s'/registry.cn-beijing.aliyuncs.com\/co1\///' | xargs -i -t docker push registry.cn-beijing.aliyuncs.com/co1/{}:v1.13.3 docker push through cache #!/usr/bin/env bash if [ -z "$VM" ]; then VM = t1 echo "VAR VM is not set" exit fi tee daemon.