Introduction

@H_404_4@There are a variety of ways to extract system resource information from a Linux server. Some of these utilities are triggered by cron,such as sysstat,while others are based on a predefined check interval,such as Nagios. Others are meant to be used interactively,such as htop or vmstat.

@H_404_4@collectdis another utility that gathers system metrics on a given system. It is written in C,giving it great performance. Its versatility,however,comes from the almost 100 plugins that is bundled with the daemon. These plugins include varIoUs read and write plugins. Some of the read plugins collect the standard Linux subsystem metrics,such as cpu,Disk,Memory and Network,while other read plugins are more specialized,such as reading Apache httpd or DNS metrics.

@H_404_4@collectd gathers these metrics,but where are they stored? collectd has a handful of write plugins that allow you either store the metrics in local round-robin databases (RRDs) or externally to another collector,such as Graphite.

@H_404_4@The collectd package in the EPEL 6 repository package is out of date. Often,users opt to compile collectd from source to obtain a newer,more recent version. The process of compiling collectd can be somewhat daunting at times because the more plugins that are available,the more dependencies are necessary.

@H_404_4@The goal of this guide is to list the necessary packages for building collectd from source with most of the plugins enabled. These dependencies can all be found in the CentOS Base and EPEL repositories.

Prerequisites

@H_404_4@Compiling any package from source requires a compiler. If you don't already have one installed,go ahead and install the GNU GCC compiler:

sudo yum install gcc

@H_404_4@For this exercise,you will also need kernel and the C library header files:

sudo yum install kernel-headers glibc-headers

Downloading collectd

@H_404_4@A link to the collectd source is hosted on the main page of thecollectd website. Download and untar the the latest source tarball. At the time of this writing,version 5.5.0 is the latest stable version.

curl --progress https://collectd.org/files/collectd-5.5.0.tar.gz | tar xz

Configuring collectd

@H_404_4@After downloading and extracting the source files,change to that directory:

cd collectd-5.5.0

@H_404_4@This package can be configured,built and installed with the typicalconfigure && make && make installsequence of commands.

@H_404_4@Start by running the configure step so that we can have a look at the available plugins:

./configure

@H_404_4@This command will output quite a bit to the screen,checking your system for the presence of varIoUs libraries,header files and binaries in the process. Have a look at the summary at the end,for example:

Configuration:
  Libraries:
    intel mic . . . . . . no (MicAccessApi not found)
    libaquaero5 . . . . . no (libaquaero5.h not found)
    libatasmart . . . . . no (atasmart.h not found)
    libcurl . . . . . . . no (curl-config Failed)
    libdbi  . . . . . . . no (dbi/dbi.h not found)
    libesmtp  . . . . . . no (libesmtp not found)
    libganglia  . . . . . no (gm_protocol.h not found)
[...output truncated...]
  Modules:
    aggregation . . . . . yes
    amqp    . . . . . . . no
    apache  . . . . . . . no
    apcups  . . . . . . . yes
    apple_sensors . . . . no
    aquaero . . . . . . . no
    ascent  . . . . . . . no
    barometer . . . . . . no
[...output truncated...]

@H_404_4@The summary at the end shows the varIoUs plugins and whether or not the configure step was able to locate the necessary prerequisites to build each plugin.

@H_404_4@Even though the configure step was not able to find many libraries or modules,collectd will still compile successfully,albeit without these plugins. Often,you would like to enable several plugins at compile time,for example:

./configure --enable-java --enable-python

@H_404_4@Without the appropriate package dependencies installed,the configure step will output the following line at the very end:

configure: error: "Some plugins are missing dependencies - see the summary
above for details"

@H_404_4@Use the two tables below to install the appropriate RPM packages for the plugins you would like to enable.

Libaries

@H_404_4@The following table shows the collectd libraries and their corresponding RPM package dependencies:

Library	RPM Package(s)
libatasmart	libatasmart-devel
libcurl	libcurl-devel
libdbi	libdbi-devel
libesmtp	libesmtp-devel
libganglia	ganglia-devel
libgcrypt	libgcrypt-devel
libhal	hal-devel
libhiredis	hiredis-devel
libiptc	iptables-devel
libjvm	java-1.8.0-openjdk-devel
libldap	openldap-devel
liblvm2app	lvm2-devel
libmemcached	libmemcached-devel
libmnl	libmnl-devel
libmodbus	libmodbus-devel
libMysqL	MysqL-devel
libnetsnmp	net-snmp-devel
libnotify	libnotify-devel
libopenipmi	OpenIPMI-devel
liboping	liboping-devel
libpcap	libpcap-devel
libperl	perl-devel,perl-ExtUtils-Embed
libpq	postgresql-devel
librabbitmq	librabbitmq-devel
librrd	rrdtool-devel
libsensors	lm_sensors-devel
libstatgrab	libstatgrab-devel
libudev	libudev-devel
libupsclient	nut-devel
libvarnish	varnish-libs-devel
libvirt	libvirt-devel
libxml2	libxml2-devel
libyajl	yajl-devel
protobuf-c	protobuf-c-devel
python	python-devel

Modules

@H_404_4@The following table shows the collectd modules and their corresponding RPM package dependencies:

Module	RPM Package(s)
amqp	librabbitmq-devel
apache	libcurl-devel
bind	libcurl-devel,libxml2-devel
ceph	yajl-devel
curl	libcurl-devel
curl_json	libcurl-devel,yajl-devel
curl_xml	libcurl-devel,libxml2-devel
dbi	libdbi-devel
dns	libpcap-devel
gmond	ganglia-devel
ipmi	OpenIPMI-devel
iptables	iptables-devel
java	java-1.8.0-openjdk-devel
log_logstash	yajl-devel
lvm	lvm2-devel
memcachec	libmemcached-devel
MysqL	MysqL-devel
netlink	libmnl-devel
Nginx	libcurl-devel
notify_desktop	libnotify-devel
notify_email	libesmtp-devel
nut	nut-devel
openldap	openldap-devel
perl	perl-devel,perl-ExtUtils-Embed
ping	liboping-devel
postgresql	postgresql-devel
python	python-devel
redis	hiredis-devel
rrdtool	rrdtool-devel
smart	libatasmart-devel,libudev-devel
snmp	net-snmp-devel
varnish	varnish-libs-devel
virt	libvirt-devel,libxml2-devel
write_http	libcurl-devel
write_redis	hiredis-devel

Notes

@H_404_4@Not all plugin dependencies were available from the CentOS Base and EPEL repositories. For these particular plugins,you would either have to:

• configure another YUM repository that has the necessary RPMs
• download and install the individual RPM from a third-party site
• build your own RPM
• compile the dependency from source

@H_404_4@With regards to the java plugin,the 1.6.0 and 1.7.0 openjdk versions,in addition to the 1.8.0 version listed above,are able to satisfy the java dependency.

Conclusion

@H_404_4@Once the plugin dependencies are sorted out,themakeandmake installsteps typically go without a hitch. In a future post,I will outline how to build the collectd RPMs using the latest available version.

原文链接：https://www.f2er.com/centos/380489.html