Linux服務(wù)器管理日記分享

# 安裝 webmin
cd /usr/local/ieternal/
mkdir download
cd download/p> p>wget a >http://downloads.sourceforge.net/project/webadmin/webmin/1.660/webmin-1.660-1.noarch.rpm?r=http%3A%2F%2Fwww.webmin.cn%2Fts=1387801624use_mirror=jaist/a>/p> p>rpm -U webmin-1.660-1.noarch.rpm /p> p># 此時(shí),可以通過: a >http://115.28.9.136:10000//a> 進(jìn)行訪問,用戶名,密碼是root的./p> p>

##############################################
#### SSH Tunnel; 經(jīng)測(cè)試,已經(jīng)打通
##############################################
# 公網(wǎng)服務(wù)器外網(wǎng)IP: 115.28.9.136
# 公網(wǎng)服務(wù)器內(nèi)網(wǎng)IP: 10.144.7.195
# 內(nèi)網(wǎng)服務(wù)器內(nèi)網(wǎng)IP: 10.144.7.191/p> p>### 1 先登錄 115.28.9.136/p> p>ssh a href="mailto:root@115.28.9.136">root@115.28.9.136/a> -p 22/p> p>#通過 webmin 修改 ssh配置,并應(yīng)用變更
# 實(shí)質(zhì)是 /etc/ssh/sshd_config 文件
GatewayPorts yes/p> p>
### 2 在 136 上登錄 10.144.7.191/p> p>ssh a href="mailto:root@10.144.7.191">root@10.144.7.191/a> -p 22/p> p>### 3 在 10.144.7.191 上執(zhí)行：
# 即通過此SSH后臺(tái)登陸 195機(jī)器，監(jiān)聽了 195:19122端口,
# 此時(shí)訪問 136:19122 的請(qǐng)求，相當(dāng)于都轉(zhuǎn)發(fā)到本地的22端口了。
# -Nf 是后臺(tái)命令的意思
ssh -Nf 10.144.7.195 -R 19122:10.144.7.191:22/p> p># 此時(shí),客戶端通過 115.28.9.136:19122 登錄，實(shí)際上登陸的就是 10.144.7.191:22 服務(wù)器了。

##### 1. 安裝squid
yum -y remove squid
yum -y install squid/p> p>##### 2. 修改配置文件
#搜索”http_access deny all”改為”http_access allow all”
# ESC, /http_access 可以進(jìn)行搜索
vim /etc/squid/squid.conf/p> p># 執(zhí)行以下修改/p> p>#http_access deny CONNECT !SSL_ports
http_access allow CONNECT !SSL_ports/p> p>#http_access deny all
http_access allow all/p> p>#coredump_dir /var/spool/squid
coredump_dir /usr/local/ieternal/squid_cache/p> p>##### 3. 設(shè)置緩存目錄
##### !!!必須修改該目錄的所屬用戶及用戶組
mkdir /usr/local/ieternal/squid_cache
chown squid:squid /usr/local/ieternal/squid_cache
cd /usr/local/ieternal/squid_cache/
/usr/sbin/squid -k shutdown
/usr/sbin/squid -z/p> p>##### 4. 啟動(dòng)
#/usr/sbin/squid
service squid start /p> p>##### 5. 查看監(jiān)聽端口狀態(tài)
netstat -ntl

#### 在191上執(zhí)行:設(shè)置代理/p> p>#yum的代理可以單獨(dú)設(shè)置
vim /etc/yum.conf
# 在最后加上
proxy=http://10.144.7.195:3128
# 也可以如此執(zhí)行
#cp /etc/yum.conf /etc/yum.conf_original
#echo 'proxy=http://10.144.7.195:3128' >> /etc/yum.conf/p> p>#在Linux的命令行底下，一般的程序都是使用http_proxy和ftp_proxy這兩個(gè)環(huán)境變量來(lái)獲得代理設(shè)置的。/p> p>#所以只要使用export http_proxy=10.144.7.195:3128就可以使用代理了。
#export http_proxy=10.144.7.195:3128/p> p># 如果要設(shè)置系統(tǒng)級(jí)別的代理，使用如下語(yǔ)句:
#vim /etc/profile/p> p>#http_proxy="10.144.7.195:3128"
#export_http_proxy

cp /root/.bash_profile /root/.bash_profile_bak_1231
echo 'http_proxy=10.144.7.195:3128' >> /root/.bash_profile
echo 'export http_proxy' >> /root/.bash_profile
source /root/.bash_profile
echo $http_proxy

# 查看含有tomcat的進(jìn)程
ps -aux | grep tomcat/p> p># 殺死指定的進(jìn)程
# xxx 是看到的進(jìn)程號(hào)
kill -9 xxx/p> p># 重新啟動(dòng)tomcat
# ... ...

[root@AY1312181745044978b4Z ~]# ssh 10.144.169.131
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
36:86:33:b9:61:f8:fc:92:df:0b:d7:b3:ae:e5:4e:fb.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:2
RSA host key for 10.144.169.131 has changed and you have requested strict checking.
Host key verification failed.

vim ~/.ssh/known_hosts

yum install lrzsz -y

sz /etc/init.d/mysql

# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 20G 6.1G 13G 33% /
tmpfs 939M 0 939M 0% /dev/shm
/dev/xvdb1 50G 21G 26G 45% /usr/local/ieternal

# du -ch --max-depth=1
4.5G ./video_source
270M ./client
8.5G ./video
23M ./family
14M ./sid
341M ./repository
20M ./guide
127M ./style
1.5G ./photo
2.0G ./music
3.0G ./video_dest
21G .
21G total

# 查看可用列表
yum list java*
# 然后安裝JDK7,openJDK6有bug，所以...
yum install java-1.7.0-openjdk* -y

# java -version
java version "1.7.0_45"
OpenJDK Runtime Environment (rhel-2.4.3.4.el6_5-x86_64 u45-b15)
OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)
# javac -version
javac 1.7.0_45

echo 'https_proxy=http://10.144.7.195:3128/' >> $HOME/.wgetrc
echo 'http_proxy=http://10.144.7.195:3128/' >> $HOME/.wgetrc
echo 'ftp_proxy=http://10.144.7.195:3128/' >> $HOME/.wgetrc

# 創(chuàng)建下載目錄
mkdir /usr/local/ieternal/download
# 進(jìn)入下載目錄
cd /usr/local/ieternal/download/p> p># 下載文件
wget a >http://mirror.bit.edu.cn/apache/tomcat/tomcat-6/v6.0.37/bin/apache-tomcat-6.0.37.tar.gz/a>
# 解壓文件
tar -zxf apache-tomcat-6.0.37.tar.gz
# 剪切目錄
mv apache-tomcat-6.0.37 /usr/local/tomcat
# 進(jìn)入tomcat配置目錄
cd /usr/local/tomcat/conf/
# 備份原始的配置文件
cp -a /usr/local/tomcat/conf/server.xml /usr/local/tomcat/conf/server.xml_original/p> p># 按需要編輯
vim /usr/local/tomcat/conf/server.xml

?xml version='1.0' encoding='utf-8'?>/p> p>Server port="8005" shutdown="SHUTDOWN">/p> p> !--APR library loader. Documentation at /docs/apr.html -->
Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
Listener className="org.apache.catalina.core.JasperListener" />
!-- Prevent memory leaks due to use of particular java/javax APIs-->
Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
!-- JMX Support for the Tomcat server. Documentation at /docs/non-existent.html -->
Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />/p> p> !-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
GlobalNamingResources>
!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
/GlobalNamingResources>/p> p>!--
renfufei,20131229,not loadbalance
-->
Service name="Catalina">
Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="250" minSpareThreads="20"/>
Connector port="80" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"
compression="on"
compressionMinSize="2048"
noCompressionUserAgents="gozilla,traviata"
compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain,application/json,application/javascript,application/x-javascript"
/>
Connector port="8009" protocol="AJP/1.3" redirectPort="8443" executor="tomcatThreadPool"/>
Engine name="Catalina" defaultHost="a >
Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
Host name="a appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
Alias>localhost/Alias>
Alias>www.renfufei.cn/Alias>
Alias>renfufei.com/Alias>
Alias>renfufei.cn/Alias>
Context docBase="/usr/local/renfufei/upload" path="/upload" />
Context docBase="/usr/local/renfufei/index" path="" />
/Host>
Host name="m.renfufei.com" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
Alias>m.renfufei.com/Alias>
Alias>m.renfufei.cn/Alias>
Context docBase="/usr/local/renfufei/upload" path="/upload" />
Context docBase="/usr/local/renfufei/blog" path="" />
/Host>
/Engine>
/Service>/p> p>/Server>

#### Tran1 上/p> p>首先安裝編譯環(huán)境。
yum install -y automake autoconf libtool gcc gcc-c++
yum install make
下載所需文件 ffmpeg.tar
wget a >http://m.ieternal.com/upload/ffmpeg.tar/a>
解壓ffmpeg.tar
tar xvf ffmpeg.tar
切換到ffmpeg目錄下，執(zhí)行以下命令。/p> p>./configure --prefix=/usr -- disable-yasm /p> p>make /p> p>make install
測(cè)試轉(zhuǎn)碼命令，注意區(qū)分文件名的大小寫 包括后綴
ffmpeg -i /usr/local/movi/qq.mov -r 25 -b 3200k -vcodec mpeg4 -ab 128k -ac 2 -ar 44100 /usr/local/movi/kk.mp4。/p> p>

#########
#Tran2.3.4上:
#下載目錄: a >http://ffmpeg.gusari.org/static/64bit//a>
#01-02版本: d1062ad9c208267241b6dfac7fa4ea25 (md5)/p> p># 創(chuàng)建目錄并下載
mkdir /usr/local/ieternal/download
mkdir /usr/local/ffmpeg
cd /usr/local/ieternal/download
wget a >http://ffmpeg.gusari.org/static/64bit/ffmpeg.static.64bit.2014-01-02.tar.gz/a>/p> p>mv /usr/local/ieternal/download/ffmpeg.static.64bit.2014-01-02.tar.gz /usr/local/ffmpeg/ffmpeg.tar.gz/p> p>cd /usr/local/ffmpeg
# md5校驗(yàn)
md5sum ffmpeg.tar.gz
# 解壓到當(dāng)前目錄
tar zxf ffmpeg.tar.gz/p> p>
# 設(shè)置 Path
cp /root/.bash_profile /root/.bash_profile_bak_0102
echo 'PATH=$PATH:/usr/local/ffmpeg' >> /root/.bash_profile
echo 'export PATH' >> /root/.bash_profile
source /root/.bash_profile
echo $PATH/p> p>

### 2. 查看IP以及網(wǎng)卡信息
# 可以發(fā)現(xiàn), eth0 的地址 inet addr:10.144.7.195, 此為內(nèi)網(wǎng)網(wǎng)卡
# 公網(wǎng)網(wǎng)卡, eth1 的地址 inet addr:115.28.9.136,
# 此外,還有一個(gè)回環(huán)地址, 127.* /p> p>ifconfig/p> p>### 2.0 查看端口占用情況
netstat -ntl/p> p>### 2.1 查看系統(tǒng)中現(xiàn)有的iptables規(guī)劃集/p> p>iptables --list -t nat/p> p>### 2.2 查看IP轉(zhuǎn)發(fā)的啟用狀態(tài)/p> p>cat /proc/sys/net/ipv4/ip_forward/p> p>########清空 nat table
# --flush -F , Delete all rules
# --delete-chain -X , Delete a user-defined chain
# --zero -Z , Zero counters in chain or all chains/p> p>iptables -F -t nat
iptables -X -t nat
iptables -Z -t nat/p> p>
######### 啟用IP包轉(zhuǎn)送,即時(shí)生效
echo 1 > /proc/sys/net/ipv4/ip_forward/p> p># IP包轉(zhuǎn)送,也可以設(shè)置 net.ipv4.ip_forward = 1
vim /etc/sysctl.conf/p> p># 然后執(zhí)行生效, 重啟依然有效
sysctl -p/p> p># 將 3306端口映射到 10.144.169.131:3306,
# PREROUTING 和 POSTROUTING 都必須設(shè)置
# 經(jīng)測(cè)試已經(jīng)打通
iptables -t nat -A PREROUTING -m tcp -p tcp --dport 6606 -j DNAT --to-destination 10.144.169.131:6606
iptables -t nat -A POSTROUTING -j MASQUERADE/p> p>

tar -zcf blog.tar.gz blog

tar -cf blog.tar blog

tar -zxf blog.tar.gz

tar -xf blog.tar

# 說(shuō)明,centos5使用的是portmap
# yum install nfs-utils portmap
# centos6 使用的是rpcbind
# yum -y install nfs-utils rpcbind

# 安裝軟件包
yum -y install nfs-utils rpcbind/p> p># 創(chuàng)建測(cè)試目錄
cd /usr/local/
mkdir /usr/local/nfstest
mkdir /usr/local/nfstest/nfsdir/p> p># 添加內(nèi)容
echo "/usr/local/nfstest 10.144.169.0/24(rw,no_root_squash)" >> /etc/exports/p> p>cat /etc/exports/p> p>chkconfig nfs on
# 啟動(dòng)
/etc/init.d/rpcbind start/p> p>/etc/init.d/nfs start

# 安裝軟件包
yum -y install nfs-utils rpcbind/p> p>showmount -e 10.144.169.135/p> p>#
cd /usr/local/
mkdir /usr/local/nfstest/p> p>mount -t nfs 10.144.169.135:/usr/local/nfstest/ /usr/local/nfstest//p> p>ll /usr/local/nfstest//p> p>
# 設(shè)置自動(dòng)加載,需要寫入到 /etc/fstab # 此處暫時(shí)還不理解
10.144.169.135:/usr/local/nfstest/ /usr/local/nfstest/ nfs nodev,ro,rsize=32768,wsize=32768 0 0

Bringing up interface eth0: Device eth0 does not seem to be present,delaying initialization. [FAILED]

# cat /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key./p> p># PCI device 0x8086:0x100f (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:d7:b6:a9", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"/p> p># PCI device 0x8086:0x100f (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:90:dd:db", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

vim /etc/sysconfig/network-scripts/ifcfg-eth0

# cat /etc/sysconfig/network-scripts/ifcfg-eth0"
DEVICE=eth1
HWADDR=00:0C:29:90:DD:DB
TYPE=Ethernet
UUID=cfb84a5c-c605-46ee-853c-214a7f4d7546
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
IPADDR="192.168.254.137"
NETMASK="255.255.255.0"
GATEWAY="192.168.254.2"/p> p>DNS1="192.168.254.2"

#重啟網(wǎng)絡(luò)
service network restart

############
############
## 服務(wù)器端/p> p># 安裝
yum -y install rsync xinetd/p> p># 啟動(dòng)rsync依賴服務(wù)
/etc/init.d/xinetd start
chkconfig xinetd on/p> p>mkdir /usr/local/ieternal
mkdir /usr/local/ieternal/upload
mkdir /etc/rsyncd/p> p>#rsync服務(wù)器的配置文件
touch /etc/rsyncd/rsyncd.conf/p> p>#定義服務(wù)器信息的文件
touch /etc/rsyncd/rsyncd.motd/p> p>#用戶密碼文件
touch /etc/rsyncd/rsyncd.secrets
chmod 600 /etc/rsyncd/rsyncd.secrets/p> p>/p> p>##############################
##############################
vim /etc/rsyncd/rsyncd.conf

address=192.168.254.137
port=873
max connections=10
uid=root
gid=root
use chroot=no
strict modes=yes/p> p>
motd file =/etc/rsyncd/rsyncd.motd

log format=%t %a %m %f %b
syslog facility=local3
timeout =300/p> p>[upload]
path=/usr/local/ieternal/upload/
exclude =repository/
comment =upload path
ignore errors
read only=no
list=yes
auth users =rsync_user
secrets file =/etc/rsyncd/rsyncd.secrets
hosts allow=192.168.254.0/255.255.255.0
hosts deny=*
pid file =/var/run/rsyncd.pid
lock file =/var/run/rsync.lock
log file =/var/log/rsync.log

#cat /etc/rsyncd/rsyncd.secrets
rsync_user:pass_word

#cat /etc/rsyncd/rsyncd.motd
services user=rsync_user;pass_word=***

#啟動(dòng)rsync服務(wù)：
/usr/bin/rsync --daemon --config=/etc/rsyncd/rsyncd.conf

# 查看端口狀態(tài)
netstat -ntl

# 1.安裝
mkdir /usr/local/ieternal
mkdir /usr/local/ieternal/upload
mkdir /etc/rsyncd
yum -y install rsync xinetd/p> p># 2.啟動(dòng)rsync依賴服務(wù)
/etc/init.d/xinetd start
chkconfig xinetd on/p> p># 3.客戶端必須配置密碼文件
touch /etc/rsync.pas
chmod 600 /etc/rsync.pas
vim /etc/rsync.pas

#cat /etc/rsync.pas
pass_word

# 4.執(zhí)行同步
# 下載:
rsync -auzv --progress --delete --password-file=/etc/rsync.pas a href="mailto:rsync_user@192.168.254.137::upload">rsync_user@192.168.254.137::upload/a> /usr/local/ieternal/upload/p> p># 上傳:
rsync -auzv --progress --delete --password-file=/etc/rsync.pas /usr/local/ieternal/upload/* a href="mailto:rsync_user@192.168.254.137::upload">rsync_user@192.168.254.137::upload/a>

rsync: failed to connect to 192.168.254.137: No route to host (113)
rsync error: error in socket IO (code 10) at clientserver.c(124) [receiver=3.0.6]

# 停止防火墻
service iptables stop

yum -y install iotop

# iotop

Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s

# 安裝 gcc
yum -y install gcc

# 安裝依賴庫(kù) libevent
yum -y install libevent libevent-devel

# 下載
mkdir /usr/local/ieternal
mkdir /usr/local/ieternal/download
cd /usr/local/ieternal/download
wget a >http://www.memcached.org/files/memcached-1.4.17.tar.gz/a>

# 計(jì)算 sha1值,
# linux自帶的哈希校驗(yàn)工具: sha1sum 或 md5sum;
# 2b4fc706d39579cf355e3358cfd27b44d40bd79c
sha1sum memcached-1.4.17.tar.gz

# 解壓
tar zxf memcached-1.4.17.tar.gz

# 安裝
# 默認(rèn)情況, memcached 安裝到 /usr/local/bin/ 目錄下

cd memcached-1.4.17
./configure
make
make install

# /usr/local/bin/memcached -p 11211 -m 64m -vv -u root
/usr/local/bin/memcached -u root

# 后臺(tái)啟動(dòng)
# -h 只顯示幫助信息
# -u root 時(shí)指定以某個(gè)用戶運(yùn)行
# -p TCP端口號(hào)；
# -m 最大內(nèi)存大小,默認(rèn)為 64M
# -vv 用 very verbose 模式啟動(dòng),調(diào)試信息和錯(cuò)誤 輸出到控制臺(tái)
# -d 作為daemon在后臺(tái)啟動(dòng)

/usr/local/bin/memcached -p 11211 -m 64m -d -u root

# 后臺(tái)啟動(dòng),端口號(hào),內(nèi)存,用戶,pid文件
/usr/local/bin/memcached -d -p 11211 -m 128m -u root -P /usr/local/memcached.pid

ps aux |grep memcached

cat /usr/local/memcached.pid

# 殺進(jìn)程,注意不是單引號(hào),而是 大鍵盤數(shù)字1前面那個(gè)字符`
kill `cat /usr/local/memcached.pid`

# 安裝GnuPG, 即GPG,一般系統(tǒng)已經(jīng)自帶
yum install gpgme -y/p> p># 查看幫助信息
gpg --help/p> p># 生成密鑰...
gpg --gen-key

/usr/local/apache2/bin/ab -c 10 -t 10 a >http://www.baidu.com//a>

cd /usr/local/apache2/bin/
# 測(cè)試100次
./ab -c 10 -n 100 a >http://www.baidu.com//a>

./ab -c 10 -t 10 -w a >http://www.baidu.com//a> >> /usr/local/ab_20140311204010.log.html

[root@ALY bin]# cd /usr/local/apache2/bin/
[root@ALY bin]# ./ab -h
使用方式: ./ab [options] [http://]hostname[:port]/path
選項(xiàng)包括:
-n requests 要執(zhí)行的請(qǐng)求的次數(shù)
-c concurrency 要構(gòu)建多少個(gè)并發(fā)線程來(lái)執(zhí)行
-t timelimit 最大限制時(shí)間,單位(Second,秒). 時(shí)間到后會(huì)等待響應(yīng)完成才退出
-b windowsize TCP協(xié)議 發(fā)送/接收的緩沖區(qū)大小, 單位字節(jié)(byte)
-p postfile POST請(qǐng)求要發(fā)送的數(shù)據(jù). 需要設(shè)置選項(xiàng) -T
-u putfile PUT請(qǐng)求要發(fā)送的數(shù)據(jù). 需要設(shè)置選項(xiàng) -T
-T content-type 發(fā)送的內(nèi)容格式頭信息 (Content-type), 例如
'application/x-www-form-urlencoded' 等,
默認(rèn)值是 'text/plain'
-v verbosity 需要打印的故障排除日志信息級(jí)別
-w 使用 HTML tables 格式打印結(jié)果信息
-i 使用 HEAD 方式請(qǐng)求,而不是 GET 方式
-x attributes 要插入作為 table attributes 的字符串
-y attributes 要插入作為 tr attributes 的字符串
-z attributes 要插入作為 td/th attributes 的字符串
-C attribute 添加 cookie信息, 示例: 'Apache=1234. (可多個(gè))
-H attribute 添加任意的頭信息(header line), 例如: 'Accept-Encoding: gzip'
插入到其他正常的頭信息后面. (可多個(gè))
-A attribute 添加基本網(wǎng)站認(rèn)證信息(Basic WWW Authentication),
屬性采用英文冒號(hào)(:) 來(lái)分隔 username 和 password.
-P attribute 添加代理用戶密碼(Basic Proxy Authentication),
屬性采用英文冒號(hào)(:) 來(lái)分隔 username 和 password.
-X proxy:port 要使用的代理服務(wù)器,以及端口號(hào)
-V 只打印版本號(hào)并且退出
-k 使用 HTTP KeepAlive 特性
-d 不要顯示響應(yīng)時(shí)間統(tǒng)計(jì)百分比.
-S 不要顯示 信任估計(jì)(? confidence estimators) 和警告信息.
-g filename 將收集的數(shù)據(jù)輸出到 Gnuplot交互式繪圖 格式文件.
-e filename 將響應(yīng)時(shí)間統(tǒng)計(jì)百分比輸出到 CSV 文件
-r 當(dāng) socket 接受到錯(cuò)誤時(shí)不要退出.
-h 顯示幫助信息(實(shí)際上就是此信息)

rdate -s time.nist.gov

crontab -e

1 * * * * root rdate -s time.nist.gov