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linux problem

One 、yum Could not find... While installing a piece of software mirrorlist.txt

Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Update Process
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. Invalid release/repo/arch combination/
removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base

resolvent ：

1、 Switch to  /etc/yum.repos.d/  Catalog :
# cd /etc/yum.repos.d/

2、 Back up old files as a precaution 
# cp CentOS-Base.repo CentOS-Base.repo.old

3、 open  vi CentOS-Base.repo And make the following replacement 
[base]
name=CentOS-$releasever - Base
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
# baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
baseurl=https://vault.centos.org/6.10/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

# released updates
[updates]
name=CentOS-$releasever - Updates
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
# baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
baseurl=https://vault.centos.org/6.10/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

# additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
# baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
baseurl=https://vault.centos.org/6.10/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

4、yum clean all  and yum update

thus , Generally, it can be used .
If you encounter the following errors
Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again or http://download.fedoraproject.org/pub/epel/6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - “The requested URL returned error: 404 Not Found”
resolvent ：

vim epel.repo, hold epel Of mirror shielding , hold baseurl Open and replace with https://vault.centos.org/6.10/os/$basearch/

Two 、linux Set up multiple network cards

ifconfig eth1:13 127.0.0.1( Yours ip)  netmask 255.255.255.0 up

3、 ... and 、linux Next use ab Conduct post Mode pressure measurement

ab -c 1 -n 1  -v 4 -p 'post.txt' -T "application/x-www-form-urlencoded" "http://hdbdt.com/api/add"
    -p: simulation post Requested data , The file format is a=1&b=2, coordination -T Use 
    -T:post Data used Content-Type Header information 
	-c： Represents the number of concurrent clients 
	-n： Represents the total number of concurrent