centos namespace，centos 环境变量
大家好，如果您还对centos namespace不太了解，没有关系，今天就由本站为大家分享centos namespace的知识，包括centos 环境变量的问题都会给大家分析到，还望可以解决大家的问题，下面我们就开始吧！
centos 6.5怎么搭建hadoop2.7.3
总体思路，准备主从服务器，配置主服务器可以无密码SSH登录从服务器，解压安装JDK，解压安装Hadoop，配置hdfs、mapreduce等主从关系。
1、环境，3台CentOS6.5，64位，Hadoop2.7.3需要64位Linux，操作系统十几分钟就可以安装完成，
Master 192.168.0.182
Slave1 192.168.0.183
Slave2 192.168.0.184
2、SSH免密码登录，因为Hadoop需要通过SSH登录到各个节点进行操作，我用的是root用户，每台服务器都生成公钥，再合并到authorized_keys
(1)CentOS默认没有启动ssh无密登录，去掉/etc/ssh/sshd_config其中2行的注释，每台服务器都要设置，
#RSAAuthentication yes
#PubkeyAuthentication yes
(2)输入命令，ssh-keygen-t rsa，生成key，都不输入密码，一直回车，/root就会生成.ssh文件夹，每台服务器都要设置，
(3)合并公钥到authorized_keys文件，在Master服务器，进入/root/.ssh目录，通过SSH命令合并，
cat id_rsa.pub>> authorized_keys
ssh root@192.168.0.183 cat~/.ssh/id_rsa.pub>> authorized_keys
ssh root@192.168.0.184 cat~/.ssh/id_rsa.pub>> authorized_keys
(4)把Master服务器的authorized_keys、known_hosts复制到Slave服务器的/root/.ssh目录
(5)完成，ssh root@192.168.0.183、ssh root@192.168.0.184就不需要输入密码了
3、安装JDK，Hadoop2.7需要JDK7，由于我的CentOS是最小化安装，所以没有OpenJDK，直接解压下载的JDK并配置变量即可
(1)下载“jdk-7u79-linux-x64.gz”，放到/home/java目录下
(2)解压，输入命令，tar-zxvf jdk-7u79-linux-x64.gz
(3)编辑/etc/profile
export JAVA_HOME=/home/java/jdk1.7.0_79
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
(4)使配置生效，输入命令，source/etc/profile
(5)输入命令，java-version，完成
4、安装Hadoop2.7，只在Master服务器解压，再复制到Slave服务器
(1)下载“hadoop-2.7.0.tar.gz”，放到/home/hadoop目录下
(2)解压，输入命令，tar-xzvf hadoop-2.7.0.tar.gz
(3)在/home/hadoop目录下创建数据存放的文件夹，tmp、hdfs、hdfs/data、hdfs/name
5、配置/home/hadoop/hadoop-2.7.0/etc/hadoop目录下的core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://192.168.0.182:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>file:/home/hadoop/tmp</value>
</property>
<property>
<name>io.file.buffer.size</name>
<value>131702</value>
</property>
</configuration>
6、配置/home/hadoop/hadoop-2.7.0/etc/hadoop目录下的hdfs-site.xml
<configuration>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/home/hadoop/dfs/name</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:/home/hadoop/dfs/data</value>
</property>
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address</name>
<value>192.168.0.182:9001</value>
</property>
<property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property>
</configuration>
7、配置/home/hadoop/hadoop-2.7.0/etc/hadoop目录下的mapred-site.xml
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
<property>
<name>mapreduce.jobhistory.address</name>
<value>192.168.0.182:10020</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>192.168.0.182:19888</value>
</property>
</configuration>
8、配置/home/hadoop/hadoop-2.7.0/etc/hadoop目录下的mapred-site.xml
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.nodemanager.auxservices.mapreduce.shuffle.class</name>
<value>org.apache.hadoop.mapred.ShuffleHandler</value>
</property>
<property>
<name>yarn.resourcemanager.address</name>
<value>192.168.0.182:8032</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address</name>
<value>192.168.0.182:8030</value>
</property>
<property>
<name>yarn.resourcemanager.resource-tracker.address</name>
<value>192.168.0.182:8031</value>
</property>
<property>
<name>yarn.resourcemanager.admin.address</name>
<value>192.168.0.182:8033</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address</name>
<value>192.168.0.182:8088</value>
</property>
<property>
<name>yarn.nodemanager.resource.memory-mb</name>
<value>768</value>
</property>
</configuration>
9、配置/home/hadoop/hadoop-2.7.0/etc/hadoop目录下hadoop-env.sh、yarn-env.sh的JAVA_HOME，不设置的话，启动不了，
export JAVA_HOME=/home/java/jdk1.7.0_79
10、配置/home/hadoop/hadoop-2.7.0/etc/hadoop目录下的slaves，删除默认的localhost，增加2个从节点，
192.168.0.183
192.168.0.184
11、将配置好的Hadoop复制到各个节点对应位置上，通过scp传送，
scp-r/home/hadoop 192.168.0.183:/home/
scp-r/home/hadoop 192.168.0.184:/home/
12、在Master服务器启动hadoop，从节点会自动启动，进入/home/hadoop/hadoop-2.7.0目录
(1)初始化，输入命令，bin/hdfs namenode-format
注意：执行这步的时候可能会报一个错误：
java.net.UnknownHostException: tiancunPC: tiancunPC: unknown error
at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
at org.apache.hadoop.net.DNS.resolveLocalHostname(DNS.java:264)
at org.apache.hadoop.net.DNS.<clinit>(DNS.java:57)
at org.apache.hadoop.hdfs.server.namenode.NNStorage.newBlockPoolID(NNStorage.java:982)
at org.apache.hadoop.hdfs.server.namenode.NNStorage.newNamespaceInfo(NNStorage.java:591)
at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:157)
at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:992)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1434)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1559)
Caused by: java.net.UnknownHostException: tiancunPC: unknown error
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
... 8 more
16/11/11 19:15:23 WARN net.DNS: Unable to determine address of the host-falling back to"localhost" address
java.net.UnknownHostException: tiancunPC: tiancunPC: unknown error
at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
at org.apache.hadoop.net.DNS.resolveLocalHostIPAddress(DNS.java:287)
at org.apache.hadoop.net.DNS.<clinit>(DNS.java:58)
at org.apache.hadoop.hdfs.server.namenode.NNStorage.newBlockPoolID(NNStorage.java:982)
at org.apache.hadoop.hdfs.server.namenode.NNStorage.newNamespaceInfo(NNStorage.java:591)
at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:157)
at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:992)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1434)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1559)
Caused by: java.net.UnknownHostException: tiancunPC: unknown error
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
... 8 more
linux中使用hostname查看为：
[root@tiancunPC hadoop-2.7.3]# hostname
tiancunPC
查看/etc/hosts为：
[root@tiancunPC hadoop-2.7.3]# cat/etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
难怪会映射不到，修改/etc/hosts
[root@tiancunPC hadoop-2.7.3]# cat/etc/hosts
127.0.0.1 tiancunPC localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
对应修改另外两个机器的主机名，在执行那个命令就可以了
(2)全部启动sbin/start-all.sh，也可以分开sbin/start-dfs.sh、sbin/start-yarn.sh
执行sbin/start-all.sh可能会有错误提示：
maps to localhost(IP), but this does not map back to the address
解决办法：
修改/etc/ssh/ssh_config
vim/etc/ssh/ssh_config
GSSAPIAuthentication no
这个时候可能还会出现这个错误提示：
hadoop出现namenode running as process 18472. Stop it first.，hadoopnamenode
解决办法：重新启动一下hadoop
(3)停止的话，输入命令，sbin/stop-all.sh
(4)输入命令，jps，可以看到相关信息
centos6编译及安装ZLMediaKit解析
centos6安装ZLMediaKit
ZLMediaKit的作者是使用Ubuntu 16开发的，但是如果要跑到测试甚至于生产上必须要部署到centos上，笔者主要是使用centos6（centos7除了下面rpm包外，编译组件操作一致），因为有需求就装完给大家分享一下。
1.安装基础编译环境
1.1 gcc-5.4的安装
注意：centos6默认gcc的版本是gcc-4.4，此时需要升级到gcc-5.4，网络上说的升级到gcc-4.7以上以支持c11是错误的，实测gcc-4.8无法成功cmake出相关基础配置框架
wget
tar-zxvf gcc-5.4.0.tar.gz
cd gcc-5.4.0
./contrib/download_prerequisites
cd..
mkdir gcc-build-5.4.0
cd gcc-build-5.4.0
../gcc-5.4.0/configure–enable-checking=release–enable-languages=c,c++–disable-multilib
make&& make install（我的虚拟机是双核处理器2.5G内存，需要1个小时,早知多配置几个核心。。。等死了）
gcc-v此时系统gcc会自动变成gcc-5.4版本
1.2 cmake-3.10安装
暂时没有测试cmake3其他版本是否能安装，目前使用的3.10与作者版本一致
tar-zxvf cmake-3.10.0-rc4.tar.gz
cd cmake-3.10.0
./bootstrap
gmake&& gmake install
yum remove cmake
ln-s/usr/local/bin/cmake/usr/bin/cmake
ln-s/usr/local/bin/cpack/usr/bin/cpack
ln-s/usr/local/bin/ctest/usr/bin/ctest
#或者是写环境变量
export PATH=$PATH:/usr/local/bin
#配置进/etc/profile之后source也可以验证：
# cmake–version
cmake version 3.10.0-rc42.编译ZLMediaKit
2.1下载代码
git clone–depth=1
cd ZLMediaKit
git submodule init
git submodule update2.2安装依赖性
yum install mysql-devel.x86_64 openssl-devel ffmpeg ffmpeg-devel另外三个rpm包也需要安装，链接如下：
libx264-devel（）
wget
libfaac-devel()
wget
libmp4v2-dev（）
wget 编译
# mkdir linux_build
# ln-s linux_build/ build
# cd build
# cmake..
— The C compiler identification is GNU 5.4.0
…
— Configuring done
— Generating done
— Build files have been written to:/usr/local/src/install_pack/ZLMediaKit/build
# make编译好可执行的文件在ZLMediaKit/git/ZLMediaKit/build/bin下面
3.运行编译好的ZLMediaKit
cd ZLMediaKit/git/ZLMediaKit/build
./bin/MediaServer
# netstat-antlp| grep./MediaServer
tcp 0 0 0.0.0.0:555 0.0.0.0:* LISTEN 26771/./MediaServer
tcp 0 0 0.0.0.0:1936 0.0.0.0:* LISTEN 26771/./MediaServer
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 26771/./MediaServer
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 26771/./MediaServer
tcp 0 0 0.0.0.0:322 0.0.0.0:* LISTEN 26771/./MediaServer
tcp 0 0 0.0.0.0:9000 0.0.0.0:* LISTEN 26771/./MediaServer如果要修改端口，在编译前，找到ZLMediaKit/git/ZLMediaKit/server/main.cpp
在namespace mediakit{下面进行对各服务器端口号的修改
总结
以上所述是小编给大家介绍的centos6编译及安装ZLMediaKit解析，大家如有疑问可以留言，或者联系站长。感谢亲们支持！！！
如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！
centos6.5安装wps提示缺libc.so.6(GLIBC_2.15)(64bit),怎办
1.试图运行程序，提示"libc.so.6: version `GLIBC_2.14' not found",原因是系统的glibc版本太低，软件编译时使用了较高版本的glibc引起的：
[ghui@StuOS bin]$ pwd
/var/VMdisks/cross/mingw32/bin
[ghui@StuOS bin]$ ls
lrelease QtCore4.dll QtNetwork4.dll QtSql4.dll QtXml4.dll
moc QtDeclarative4.dll QtOpenGL4.dll QtSvg4.dll rcc
phonon4.dll QtGui4.dll QtScript4.dll QtTest4.dll uic
qmake QtMultimedia4.dll QtScriptTools4.dll QtWebKit4.dll
[ghui@StuOS bin]$./qmake
./qmake:/lib64/libc.so.6: version `GLIBC_2.14' not found(required by./qmake)
2.查看系统glibc支持的版本：
[ghui@StuOS bin]$ strings/lib64/libc.so.6|grep GLIBC_
GLIBC_2.2.5
GLIBC_2.2.6
GLIBC_2.3
GLIBC_2.3.2
GLIBC_2.3.3
GLIBC_2.3.4
GLIBC_2.4
GLIBC_2.5
GLIBC_2.6
GLIBC_2.7
GLIBC_2.8
GLIBC_2.9
GLIBC_2.10
GLIBC_2.11
GLIBC_2.12
GLIBC_PRIVATE
[ghui@StuOS bin]$ rpm-qa|grep glibc
glibc-static-2.12-1.80.el6_3.6.x86_64
glibc-headers-2.12-1.80.el6_3.6.x86_64
glibc-common-2.12-1.80.el6_3.6.x86_64
glibc-devel-2.12-1.80.el6_3.6.x86_64
glibc-static-2.12-1.80.el6_3.6.i686
glibc-devel-2.12-1.80.el6_3.6.i686
glibc-2.12-1.80.el6_3.6.i686
glibc-2.12-1.80.el6_3.6.x86_64
3.可以看到最高只支持2.12版本，所以考虑编译解决这个问题：
a.到下载最新版本，我这里下载了glibc-2.14.tar.xz这个版本，解压到任意目录准备编译
b.这里解压到/var/VMdisks/glibc-2.14/
[ghui@StuOS bin]$ cd/var/VMdisks/glibc-2.14/
[ghui@StuOS glibc-2.14]$ pwd
/var/VMdisks/glibc-2.14
[ghui@StuOS glibc-2.14]$ ls
abilist config.h.in intl README.libm
abi-tags config.log io resolv
aclocal.m4 config.make.in libc-abis resource
aout configure libidn rt
argp configure.in libio Rules
assert conform LICENSES scripts
autom4te.cache CONFORMANCE locale setjmp
bits COPYING localedata shadow
BUGS COPYING.LIB login shlib-versions
build cppflags-iterator.mk mach signal
CANCEL-FCT-WAIVE crypt Makeconfig socket
CANCEL-FILE-WAIVE csu Makefile soft-fp
catgets ctype Makefile.in stdio-common
ChangeLog debug Makerules stdlib
ChangeLog.1 dirent malloc streams
ChangeLog.10 dlfcn manual string
ChangeLog.11 elf math sunrpc
ChangeLog.12 extra-lib.mk misc sysdeps
ChangeLog.13 extra-modules.mk NAMESPACE sysvipc
ChangeLog.14 FAQ NEWS termios
ChangeLog.15 FAQ.in nis test-skeleton.c
ChangeLog.16 gmon NOTES time
ChangeLog.17 gnulib nptl timezone
ChangeLog.2 grp nptl_db tls.make.c
ChangeLog.3 gshadow nscd version.h
ChangeLog.4 hesiod nss Versions.def
ChangeLog.5 hurd o-iterator.mk wcsmbs
ChangeLog.6 iconv po wctype
ChangeLog.7 iconvdata posix WUR-REPORT
ChangeLog.8 include PROJECTS
ChangeLog.9 inet pwd
conf INSTALL README
c.在glibc源码目录建立构建目录，并cd进入构建目录
[ghui@StuOS glibc-2.14]$ mkdir build
[ghui@StuOS glibc-2.14]$ cd build
d.运行configure配置，make&& sudo make install
[ghui@StuOS build]$../configure--prefix=/opt/glibc-2.14
[ghui@StuOS build]$ make-j4
[ghui@StuOS build]$ sudo make install
[sudo] password for ghui:
4.临时修改环境变量
[ghui@StuOS bin]$ export LD_LIBRARY_PATH=/opt/glibc-2.14/lib:$LD_LIBRARY_PATH
[ghui@StuOS glibc-2.14]$ cd/var/VMdisks/cross/mingw32/bin/
[ghui@StuOS bin]$./qmake
Usage:./qmake [mode] [options] [files]
QMake has two modes, one mode for generating project files based on
some heuristics, and the other for generating makefiles. Normally you
shouldn't need to specify a mode, as makefile generation is the default
mode for qmake, but you may use this to test qmake on an existing project
...
