brew install micromamba

# 根据命令提示，修改~/.zshrc文件
micromamba shell init -s zsh -p ~/.micromamba
# 添加配置文件
$ cat ~/.mambarc
channels:
  - conda-forge
always_yes: false

micromamba create -n python310 python=3.10
# 激活环境
micromamba activate python310
# 然后可以用 micromamba 或者 pip 装东西
micromamba install package_1 package_2=version
## 具体请参考 https://mamba.readthedocs.io/en/latest/
micromamba --help

sudo vim /etc/ssh/sshd_config

TCPKeepAlive yes
ClientAliveInterval 60
ClientAliveCountMax 3

sudo vim /etc/ssh/ssh_config

TCPKeepAlive yes
ServerAliveInterval 60
ServerAliveCountMax 3

uname -r

uname -a

cat /etc/redhat-release

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

yum --disablerepo="*" --enablerepo="elrepo-kernel" list available

...
kernel-lt.x86_64              4.4.155-1.el7.elrepo
kernel-lt-devel.x86_64        4.4.155-1.el7.elrepo
...

yum --enablerepo=elrepo-kernel install kernel-lt

sudo awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

0 : CentOS Linux (4.4.241-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core)
2 : CentOS Linux (0-rescue-651e1b90bb3149809cdeb8cc80e72c43) 7 (Core)

sudo yum install dnsmasq

cat /etc/dnsmasq.conf

#######这里表示 严格按照 resolv-file 文件中的顺序从上到下进行 DNS 解析, 直到第一个成功解析成功为止
#strict-order

###同时发送所有的查询到所有的dns服务器，谁快就用谁
all-servers

listen-address=127.0.0.1

###不让dnsmasq去读/etc/hosts文件
no-hosts

## 设置缓存条目
cache-size=10240

#允许客户端缓存的时间单位为秒
local-ttl=10
max-cache-ttl=15

###开启日志
#log-queries
##配置日志文件
#log-facility=/data/logs/dnsmasq.log

cat /etc/resolv.dnsmasq.conf

nameserver 223.5.5.5
nameserver 114.114.114.114
nameserver 222.246.129.80

systemctl start dnsmasq

dig www.zhangwenbing.com

server=/cn/114.114.114.114
server=/taobao.com/114.114.114.114
server=/taobaocdn.com/114.114.114.114

server=/google.com/8.8.8.8

address=/ad.youku.com/127.0.0.1
address=/ad.iqiyi.com/127.0.0.1

cat /etc/ssh/ssh_config

Host jump-server
    User xxxx
    Hostname yyy.yyy.yyy.yyy
    Port 22

Host 10.*
    ProxyCommand ssh -q -W %h:%p jump-server

 http://mirrors.aliyun.com/epel/6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"

cat /etc/yum.repos.d/CentOS-Base.repo

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-6.10 - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.10/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

#released updates
[updates]
name=CentOS-6.10 - Updates - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.10/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

#additional packages that may be useful
[extras]
name=CentOS-6.10 - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.10/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-6.10 - Plus - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.10/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

#contrib - packages by Centos Users
[contrib]
name=CentOS-6.10 - Contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos-vault/6.10/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

yum clean all
yum makecache

yum install -y tcpdump

tcpdump -i bond0 udp port xxxx and host xxx.x.xx.xxx -s0 -G 600  -w %Y_%m%d_%H%M_%S.pcap

cat /etc/sysctl.conf
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.all.rp_filter = 0
# 修改默认网络的缓存大小 这个很重要不然
net.core.rmem_max = 50000000
net.core.rmem_default = 50000000

sysctl -p

# 添加以上配置后需要重启系统
reboot

# 不重启的话一定要执行以下命令
for i in /proc/sys/net/ipv4/conf/*/rp_filter ; do echo 0 > "$i";   done

> route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         localhost       0.0.0.0         UG    100    0        0 eno16780032
172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
192.168.10.0    0.0.0.0         255.255.255.0   U     100    0        0 eno16780032