centos安装NETCAT

CentOS下安装netcat
使用zookeeper过程中，需要监控集群状态。在使用四字命令时（echo conf | nc localhost 2181），报出如下错误：-bash: netcat: command not found。

我的系统是CentOS 6.6, 64位系统，默认没有安装netcat，下面时安装过程中遇到的一些问题。(下面都是使用root用户)

下载netcat安装包
wget http://sourceforge.net/projects/netcat/files/netcat/0.7.1/netcat-0.7.1-1.i386.rpm
执行安装rpm -ihv netcat-0.7.1-1.i386.rpm

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rpm -ihv netcat-0.7.1-1.i386.rpm

warning: netcat-0.7.1-1.i386.rpm: Header V3 DSA/SHA1 Signature, key ID b2d79fc1: NOKEY

error: Failed dependencies:

libc.so.6 is needed by netcat-0.7.1-1.i386

libc.so.6(GLIBC_2.0) is needed by netcat-0.7.1-1.i386

libc.so.6(GLIBC_2.1) is needed by netcat-0.7.1-1.i386

libc.so.6(GLIBC_2.3) is needed by netcat-0.7.1-1.i386


解决依赖包问题
yum list glibc*

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Loaded plugins: fastestmirror, security

Loading mirror speeds from cached hostfile

* base: mirrors.aliyun.com

* extras: mirrors.aliyun.com

* updates: mirrors.aliyun.com

Installed Packages

glibc.x86_64 2.12-1.149.el6 @anaconda-CentOS-201410241409.x86_64/6.6

glibc-common.x86_64 2.12-1.149.el6 @anaconda-CentOS-201410241409.x86_64/6.6

glibc-devel.x86_64 2.12-1.149.el6 @anaconda-CentOS-201410241409.x86_64/6.6

glibc-headers.x86_64 2.12-1.149.el6 @anaconda-CentOS-201410241409.x86_64/6.6

Available Packages

glibc.i686 2.12-1.149.el6_6.9 updates

glibc.x86_64 2.12-1.149.el6_6.9 updates

glibc-common.x86_64 2.12-1.149.el6_6.9 updates

glibc-devel.i686 2.12-1.149.el6_6.9 updates

glibc-devel.x86_64 2.12-1.149.el6_6.9 updates

glibc-headers.x86_64 2.12-1.149.el6_6.9 updates

glibc-static.i686 2.12-1.149.el6_6.9 updates

glibc-static.x86_64 2.12-1.149.el6_6.9 updates

glibc-utils.x86_64 2.12-1.149.el6_6.9 updates

安装命令：

yum install glibc.i686

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rpm -ihv netcat-0.7.1-1.i386.rpm

warning: netcat-0.7.1-1.i386.rpm: Header V3 DSA/SHA1 Signature, key ID b2d79fc1: NOKEY

Preparing... ########################################### [100%]

1:netcat ########################################### [100%]


安装netcat包
rpm -ihv netcat-0.7.1-1.i386.rpm

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rpm -ihv netcat-0.7.1-1.i386.rpm

warning: netcat-0.7.1-1.i386.rpm: Header V3 DSA/SHA1 Signature, key ID b2d79fc1: NOKEY

Preparing... ########################################### [100%]

1:netcat ########################################### [100%]

再次测试zookeeper的四字命令，终于成功啦。

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echo conf | nc localhost 2181

clientPort=2181

dataDir=/data/zk/data1/version-2

dataLogDir=/data/zk/log1/version-2

tickTime=2000

maxClientCnxns=500

minSessionTimeout=4000

maxSessionTimeout=40000

serverId=1

initLimit=10

syncLimit=5

electionAlg=3

electionPort=3891

quorumPort=2891

peerType=0