注意需要自行下载nagios,nagios-plugin,nrpe
脚本只完成nagios，nagios-plugin,apache,nrpe的安装集成。

#!/bin/bash
#########################
#
#install nagios on centos7
#
#########################

#依赖系统库
g_sys_lib=(
gcc glibc glibc-common  gcc-c++ 
gd gd-devel 
openssl openssl-devel
unzip  bzip2 
libxml2 libxml2-devel
)

g_src_dir=`pwd`/src
g_log=`pwd`/install_nagios.log
g_base_dir=/usr/local
g_apr=apr-1.4.5
g_pcre=pcre-8.33
g_apr_util=apr-util-1.3.12
g_httpd=httpd-2.4.28
g_php=php-5.6.25
g_nagios=nagios-4.3.2
g_nplugin=nagios-plugins-2.2.1
g_nrpe=nrpe-2.12 

#下载软件
function download_src_code(){
    [ ! -d $g_src_dir ] && mkdir -p $g_src_dir
    cd $g_src_dir
    wget http://archive.apache.org/dist/apr/apr-1.4.5.tar.gz  
    wget http://archive.apache.org/dist/apr/apr-util-1.3.12.tar.gz 
    wget http://jaist.dl.sourceforge.net/project/pcre/pcre/8.33/pcre-8.33.tar.gz
    wget http://mirror.bit.edu.cn/apache//httpd/httpd-2.4.28.tar.gz
    wget http://cn2.php.net/distributions/php-5.6.25.tar.gz
}

#通用安装
function common_install_soft(){
    echo ">>>>start install $1"
    local soft_name=$1
    local configure=$2
    cd $g_src_dir                               && \
    tar -xf ${soft_name}.tar.gz            && \
    cd ${soft_name}                           && \
    ./configure $configure                  && \
    make && make install
        echo ">>>>end install soft $1 with $?" >>$g_log
}

#安装系统依赖
function install_sys_lib(){
    for lib in $g_sys_lib
    do
            rpm -q $lib 
            [ $? -ne 0 ] && yum install -y $? 
    done
    echo ">>>>end $FUNCNAME" >> $g_log
}

#添加用户和组
function add_user_group(){
    /usr/sbin/groupadd nagios 
    /usr/sbin/groupadd nagcmd
    /usr/sbin/groupadd apache
    /usr/sbin/useradd  nagios -g nagios -s /sbin/nologin
    /usr/sbin/useradd  apache -g apache -s /sbin/nologin
    /usr/sbin/usermod -a -G nagcmd nagios
    /usr/sbin/usermod -a -G nagcmd apache
    echo ">>>>end $FUNCNAME" >> $g_log
}

#安装apache
function install_httpd_php(){
    echo ">>>>start $FUNCNAME"
    yum remove -y apr-util-devel apr apr-util-mysql \
      apr-docs apr-devel apr-util apr-util-docs
    common_install_soft ${g_apr}      "--prefix=$g_base_dir/apr"
    common_install_soft ${g_apr_util} "--prefix=$g_base_dir/apr-util \                                                                                --with-apr=$g_base_dir/apr/bin/apr-1-config"
    common_install_soft ${g_pcre}     "--prefix=$g_base_dir/pcre"
    common_install_soft ${g_httpd}    "--prefix=$g_base_dir/apache2 \
       --with-apr=$g_base_dir/apr \
       --with-apr-util=$g_base_dir/apr-util \
       --with-pcre=$g_base_dir/pcre"
    common_install_soft ${g_php}     "--prefix=$g_base_dir/php \
       --with-apxs2=$g_base_dir/apache2/bin/apxs"
        echo ">>>>end $FUNCNAME" >> $g_log
}

#安装nagios
function install_nagios_core(){
    echo ">>>>start install nagios core" >>$g_log
    cd $g_src_dir && tar -xf $g_nagios.tar.gz               && \
    cd $g_nagios                                        && \
    ./configure --with-command-group=nagcmd             && \
    make all                                                                    && \
    make install                                                                && \
    make install-init                                                   && \
    make install-config                                                 && \
    make install-commandmode                                            && \
    /usr/bin/install -c -m 644 $g_src_dir/$g_nagios/sample-config/httpd.conf \
                $g_base_dir/apache2/conf/extra/httpd-nagios.conf          && \
    $g_base_dir/apache2/bin/htpasswd -bc \
                $g_base_dir/nagios/etc/htpasswd.users nagiosadmin admin && \
    chkconfig --add nagios                                                  && \
    chkconfig nagios on
    echo ">>>>end $FUNCNAME with $?" >> $g_log
}

#安装nagios插件
function install_nagios_plugin(){
        common_install_soft ${g_nplugin} "--with-nagios-user=nagios \                                                                      --with-nagios-group=nagios"
}

#安装nrpe
function install_nrpe(){
        cd $g_src_dir
        tar -xf nrpe-2.12.tar.gz 
        cd nrpe-2.12
        ./configure 
        make all
        make install-plugin
}

#集成apache和nagios
function init_config(){
    local conf=$g_base_dir/apache2/conf/httpd.conf
    echo "1.开启apache cgi模块,解决点击nagios出现下载cgi文件问题"
    sed -i "s+^#LoadModule cgid_module+LoadModule cgid_module+g" $conf

    echo "2.开启apache php模块,解决403禁止访问问题"
    sed -i "s/DirectoryIndex index.html/& index.php/g"      $conf
    sed -i "/application\/x-gzip/aAddType application\/x-httpd-php .php" $conf

    echo "3.添加apache nagios配置文件"
    echo "Include conf/extra/httpd-nagios.conf" >> $conf

    echo "4.设置apache 运行用户和组为apache"
    sed -i "s/^User.*$/User apache/g"       $conf
    sed -i "s/^Group.*$/Group apache/g" $conf
}

function main(){
    echo ">>>>start time `date`" >> $g_log
    download_src_code
    install_sys_lib
    add_user_group
    install_httpd_php
    install_nagios_core
    install_nagios_plugin
    install_nrpe
    init_config
    echo ">>>>end time `date`" >> $g_log
}
main