怪不得oldboy不支持初学者用RHEL。
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这段时间在2台虚拟机上分别通过CentOS5.8和RHEL6.0安装nagios的客户端，CentOS一切顺利。但是，RHEL不断给我制造麻烦。前几天在RHEL环境yum安装mysql遇到问题，耽误2天时间。昨晚又因为在RHEL上安装dos2unix命令，昨晚加上今天下午又折腾1个小时。
今天凌晨通过下载软件包，编译安装始终报错。今天下午在百度搜索yum安装这个命令，也不怎么得要领。于是又尝试直接通过yum指定“dos2unix*”（执行“yum -y install dos2unix*”命令），没想到，竟然安装成功，后面的测试也没有问题。
昨晚折腾到0:40，实在不想睡得太晚。虽然有些不甘心，但还是收拾收拾准备就寝。那时候，就又开始犹豫：到底要不要坚持继续在RHEL上安装nagios客户端。即使次日把dos2unix命令成功安装，后面可能还会遇到其它问题。但是，转念再想：发现问题，解决问题的过程，正是自己提高的过程。毕竟，工作基本落实，不再为生计担心。再花些时间解决这类小问题，应该也没什么大不了的。
况且，linux本身就是各类小知识的繁杂集合。如果小问题都不能处理，大问题遇到的时候，更抓瞎。
为什么RHEL6没有dos2unix这个命令呢？是我当初在安装系统的时候没有选择好软件包的原因吗？天知道……
----------------------------------------开始说正事----------------------------------------------
[root@nagios_client02 nagios]# dos2unix /usr/local/nagios/libexec/check_memory.pl
-bash: dos2unix: command not found
[root@nagios_client02 nagios]# dos2unix /usr/local/nagios/libexec/check_iostat
-bash: dos2unix: command not found
[root@nagios_client02 nagios]# cd ..
执行dos2unix命令，提示命令没有找到。可能是dos2unix在RHEL环境没有安装。
在百度搜索安装dos2unix命令，根据文档：“http://blog.csdn.net/bluewhale1/article/details/8074978——dos2unix命令找不到怎么办”操作。
在http://linux.softpedia.com/progDownload/Dos2Unix-Download-5519.html下载hd2u-1.0.0.tgz包。
下载页面全部都是英文内容，经过摸索，这里简单说明下载步骤：点击左边的“DOWNLOAD”按纽，右边的“DOWNLOAD LOCATIONS:”才能显示出来。点击“Sources mirror 1(tgz)”链接，进入下一级页面，过一段时间，就会自动弹出下载对话框。
[root@nagios_client02 tools]# wget http://terminus.sk/~hany/_data/hd2u/hd2u-1.0.0.tgz
--2014-09-07 00:03:11-- http://terminus.sk/~hany/_data/hd2u/hd2u-1.0.0.tgz
Resolving terminus.sk... 92.240.244.10
Connecting to terminus.sk|92.240.244.10|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 54461 (53K) [application/x-gzip]
Saving to: `hd2u-1.0.0.tgz'
100%[===========================================================================================================================>] 54,461 248K/s in 0.2s
2014-09-07 00:03:28 (248 KB/s) - `hd2u-1.0.0.tgz' saved [54461/54461]
[root@nagios_client02 tools]# ll hd2u-1.0.0.tgz
-rw-r--r-- 1 root root 54461 Mar 15 2005 hd2u-1.0.0.tgz
[root@nagios_client02 tools]# tar zxvf hd2u-1.0.0.tgz
hd2u-1.0.0/
hd2u-1.0.0/configure
hd2u-1.0.0/dos2unix.c
hd2u-1.0.0/NEWS
hd2u-1.0.0/config.h.in
hd2u-1.0.0/packaging/
hd2u-1.0.0/packaging/hd2u.spec
hd2u-1.0.0/CREDITS
hd2u-1.0.0/configure.in
hd2u-1.0.0/README
hd2u-1.0.0/COPYING
hd2u-1.0.0/AUTHORS
hd2u-1.0.0/install-sh
hd2u-1.0.0/INSTALL
hd2u-1.0.0/Makefile.in
hd2u-1.0.0/TODO
hd2u-1.0.0/ChangeLog
[root@nagios_client02 tools]# cd hd2u-1.0.0
[root@nagios_client02 hd2u-1.0.0]# ./configure
Configuring hd2u 1.0.0
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking for a BSD-compatible install... /usr/bin/install -c
checking for getopt_long in -lpopt... no
configure: error: *** libpopt not found
配置报错。
[root@nagios_client02 hd2u-1.0.0]# make
make: *** No targets specified and no makefile found. Stop.
编译也有问题。
在“http://rpm.pbone.net/index.php3/stat/4/idpl/17960519/dir/other/com/popt-1.14-2rt.x86_64.rpm.html”页面下载popt-1.14-2rt.x86_64.rpm包。
在打开的页面里，右键单击“popt-1.14-2rt.x86_64.rpm”链接，在弹出的快捷菜单里选择“复制链接地址”，就可以在linux环境使用wget命令下载这个包。
[root@nagios_client02 hd2u-1.0.0]# wget ftp://ftp.pbone.net/mirror/ftp.sourceforge.net/pub/sourceforge/r/ro/roblinux/64-32_pkg/base/x86_64/popt-1.14-2rt.x86_64.rpm
--2014-09-07 00:09:30-- ftp://ftp.pbone.net/mirror/ftp.sourceforge.net/pub/sourceforge/r/ro/roblinux/64-32_pkg/base/x86_64/popt-1.14-2rt.x86_64.rpm
=> `popt-1.14-2rt.x86_64.rpm'
Resolving ftp.pbone.net... 85.14.85.4
Connecting to ftp.pbone.net|85.14.85.4|:21... connected.
Logging in as anonymous ... Logged in!
==> SYST ... done. ==> PWD ... done.
==> TYPE I ... done. ==> CWD (1) /mirror/ftp.sourceforge.net/pub/sourceforge/r/ro/roblinux/64-32_pkg/base/x86_64 ... done.
==> SIZE popt-1.14-2rt.x86_64.rpm ... 75973
==> PASV ... done. ==> RETR popt-1.14-2rt.x86_64.rpm ... done.
Length: 75973 (74K) (unauthoritative)
100%[===========================================================================================================================>] 75,973 7.21K/s in 10s
2014-09-07 00:10:30 (7.21 KB/s) - `popt-1.14-2rt.x86_64.rpm' saved [75973]
[root@nagios_client02 hd2u-1.0.0]# ll popt-1.14-2rt.x86_64.rpm
-rw-r--r-- 1 root root 75973 Sep 7 00:10 popt-1.14-2rt.x86_64.rpm
[root@nagios_client02 hd2u-1.0.0]# mv popt-1.14-2rt.x86_64.rpm ../
[root@nagios_client02 hd2u-1.0.0]# cd ..
[root@nagios_client02 tools]# ll popt-1.14-2rt.x86_64.rpm
-rw-r--r-- 1 root root 75973 Sep 7 00:10 popt-1.14-2rt.x86_64.rpm
[root@nagios_client02 tools]# rpm -ivh popt-1.14-2rt.x86_64.rpm
Preparing... ########################################### [100%]
package popt-1.14-2rt.x86_64 is intended for a x86_64 architecture
file /usr/share/locale/cs/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/da/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/de/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/es/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/fr/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/ga/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/gl/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/hu/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/is/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/it/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/ja/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/ko/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/nb/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/nl/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/pl/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/pt/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/ro/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/ru/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/sk/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/sl/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/sv/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/tr/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/uk/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/vi/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/wa/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
file /usr/share/locale/zh_CN/LC_MESSAGES/popt.mo from install of popt-1.14-2rt.x86_64 conflicts with file from package popt-1.13-7.el6.i686
通过输出发现，这个包应该是用于64位系统，而虚拟机里的RHEL是32位系统。安装也有问题。
[root@nagios_client02 tools]# cd hd2u-1.0.0
[root@nagios_client02 hd2u-1.0.0]# ./configure
Configuring hd2u 1.0.0
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking for a BSD-compatible install... /usr/bin/install -c
checking for getopt_long in -lpopt... no
configure: error: *** libpopt not found
[root@nagios_client02 hd2u-1.0.0]# make
make: *** No targets specified and no makefile found. Stop.
[root@nagios_client02 hd2u-1.0.0]# make install
make: *** No rule to make target `install'. Stop.
[root@nagios_client02 hd2u-1.0.0]# cd ..
配置、编译和安装都有报错。
也尝试找过32位版本的这个软件包，但不知道是找到的版本有问题，还是版本号不一致。都是在执行“rpm -ivh”命令时，没有执行成功。
尝试使用yum安装dos2unix，意外成功。
[root@nagios_client02 tools]# yum -y install dos2unix*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.grandcloud.cn
* extras: ftp.yzu.edu.tw
* updates: mirrors.grandcloud.cn
base | 3.7 kB 00:00
extras | 3.3 kB 00:00
updates | 3.4 kB 00:00
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package dos2unix.i686 0:3.1-37.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=====================================================================================================================================================================
Package Arch Version Repository Size
=====================================================================================================================================================================
Installing:
dos2unix i686 3.1-37.el6 base 15 k
Transaction Summary
=====================================================================================================================================================================
Install 1 Package(s)
Total download size: 15 k
Installed size: 17 k
Downloading Packages:
dos2unix-3.1-37.el6.i686.rpm | 15 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : dos2unix-3.1-37.el6.i686 1/1
Verifying : dos2unix-3.1-37.el6.i686 1/1
Installed:
dos2unix.i686 0:3.1-37.el6
Complete!
[root@nagios_client02 tools]# whereis dos2unix
dos2unix: /usr/bin/dos2unix /usr/share/man/man1/dos2unix.1.gz
[root@nagios_client02 tools]# dos2unix /usr/local/nagios/libexec/check_memory.pl
dos2unix: converting file /usr/local/nagios/libexec/check_memory.pl to UNIX format ...
[root@nagios_client02 tools]# dos2unix /usr/local/nagios/libexec/check_iostat
dos2unix: converting file /usr/local/nagios/libexec/check_iostat to UNIX format ...
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