puppet 的安装与配置，请看上一篇文章。
这里默认你已经把它安装好了。
想让两台(或N台)机器相互通信，先要设置它们之间的Host文件。
每一台机器分别执行如下命令
sudo vi /etc/hosts把要相互通信的所有机器的IP 和 别名添加进来。比如先以server端为例
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.23.10.237 puppet-server.noah.blogjava.net
#上面可能是打开这个文件里默认的，不用管，直接在下面加agent的ip就可以了,有多少加多少。
10.52.27.71 agent001.noah-test.net
10.52.27.72 agent002.noah-test.net
10.52.27.73 agent003.noah-test.net
接下来把上面的都复制，然后，分别考到其它的机器里面。
接下来回到agent端，配置puppet 的配置文件，执行如下命令
sudo
vi /etc/puppetlabs/puppet/puppet.conf在打开的文件里面填写如下信息
[main]
#这个certname就是上面host里面的名字
certname = agent001.noah-test.net
#server 就是puppet的server的地址
server = puppet-server.noah.blogjava.net
environment = production
runinterval = 1h 然后在agent端，执行如下命令，向server端申请证书
sudo /opt/puppetlabs/bin/puppet agent --test
然后，会出现这样的信息Info: Creating a new SSL key for agent01.noah-testInfo: Caching certificate for caInfo: csr_attributes file loading from /etc/puppetlabs/puppet/csr_attributes.yaml
Exiting; no certificate found and waitforcert is disabled
证明，申请成功，等待server端同意。这时可以转到server端，执行如下命令查看如些机器要申请证书
sudo /opt/puppetlabs/bin/puppet cert list --all 这里会显示出所有申请过的和正在等待审批的agent的certname 的名字。审批通过的前面有个“+”。
接下来执行如下命令进行单独审批
sudo /opt/puppetlabs/bin/puppet cert sign agent001.noah-test.net
也可以直接在sgin 后面加 "--all",进行全部审批。
审批完成后，再回到agent端，执行同样的命令
sudo /opt/puppetlabs/bin/puppet agent --test 如下显示的全是类似如下绿色的信息，证明它们之间的通信已经建立成功
Info: Using configured environment 'production'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Caching catalog for agent001.noah-test.net
Info: Applying configuration version '1481877703'
问题汇总：
cloud@cdt-dev-cafews-yabinx:/etc/puppetlabs/puppet> sudo puppet agent -t
Warning: Setting 'pluginsync' is deprecated.
(at /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/defaults.rb:1713:in `block in <module:Puppet>')
Warning: Unable to fetch my node definition, but the agent run will continue:
Warning: getaddrinfo: Name or service not known
Info: Retrieving pluginfacts
Error: /File[/var/lib/puppet/facts.d]: Failed to generate additional resources using 'eval_generate': getaddrinfo: Name or service not known
Error: /File[/var/lib/puppet/facts.d]: Could not evaluate: Could not retrieve file metadata for puppet:///pluginfacts: getaddrinfo: Name or service not known
Info: Retrieving plugin
Error: /File[/var/lib/puppet/lib]: Failed to generate additional resources using 'eval_generate': getaddrinfo: Name or service not known
Error: /File[/var/lib/puppet/lib]: Could not evaluate: Could not retrieve file metadata for puppet:///plugins: getaddrinfo: Name or service not known
Info: Loading facts
Error: Could not retrieve catalog from remote server: getaddrinfo: Name or service not known
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run
Error: Could not send report: getaddrinfo: Name or service not known
用的命令不对，改用这个
sudo /opt/puppetlabs/bin/puppet agent --test
sudo/opt/puppetlabs/bin/puppet agent --test
Warning: Unable to fetch my node definition, but the agent run will continue:
Warning: Server hostname 'cdt-dev-cafews-yabinx' did not match server certificate; expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
Info: Retrieving pluginfacts
Error: /File[/opt/puppetlabs/puppet/cache/facts.d]: Failed to generate additional resources using 'eval_generate': Server hostname 'cdt-dev-cafews-yabinx' did not match server certificate; expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
Error: /File[/opt/puppetlabs/puppet/cache/facts.d]: Could not evaluate: Could not retrieve file metadata for puppet:///pluginfacts: Server hostname 'cdt-dev-cafews-yabinx' did not match server certificate; expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
Info: Retrieving plugin
Error: /File[/opt/puppetlabs/puppet/cache/lib]: Failed to generate additional resources using 'eval_generate': Server hostname 'cdt-dev-cafews-yabinx' did not match server certificate; expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
Error: /File[/opt/puppetlabs/puppet/cache/lib]: Could not evaluate: Could not retrieve file metadata for puppet:///plugins: Server hostname 'cdt-dev-cafews-yabinx' did not match server certificate; expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
Error: Could not retrieve catalog from remote server: Server hostname 'cdt-dev-cafews-yabinx' did not match server certificate; expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run
Error: Could not send report: Server hostname 'cdt-dev-cafews-yabinx' did not match server certificate; expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
其实它已经告诉你了，改一下/etc/hosts就可以了，改成下面的其中一个
expected one of cdt-dev-cafews-yabinx.emea1.cis.trcloud, DNS:puppet, DNS:cdt-dev-cafews-yabinx.emea1.cis.trcloud
sudo /opt/puppetlabs/bin/puppet agent --test
Warning: Unable to fetch my node definition, but the agent run will continue:
Warning: SSL_connect returned=1 errno=0 state=error: certificate verify failed: [unable to get local issuer certificate for /CN=cdt-dev-cafews-yabinx2.emea1.cis.trcloud]
Info: Retrieving pluginfacts
Error: /File[/opt/puppetlabs/puppet/cache/facts.d]: Failed to generate additional resources using 'eval_generate': SSL_connect returned=1 errno=0 state=error: certificate verify failed: [unable to get local issuer certificate for /CN=cdt-dev-cafews-yabinx2.emea1.cis.trcloud]
Error: /File[/opt/puppetlabs/puppet/cache/facts.d]: Could not evaluate: Could not retrieve file metadata for puppet:///pluginfacts: SSL_connect returned=1 errno=0 state=error: certificate verify failed: [unable to get local issuer certificate for /CN=cdt-dev-cafews-yabinx2.emea1.cis.trcloud]
Info: Retrieving plugin
Error: /File[/opt/puppetlabs/puppet/cache/lib]: Failed to generate additional resources using 'eval_generate': SSL_connect returned=1 errno=0 state=error: certificate verify failed: [unable to get local issuer certificate for /CN=cdt-dev-cafews-yabinx2.emea1.cis.trcloud]
Error: /File[/opt/puppetlabs/puppet/cache/lib]: Could not evaluate: Could not retrieve file metadata for puppet:///plugins: SSL_connect returned=1 errno=0 state=error: certificate verify failed: [unable to get local issuer certificate for /CN=cdt-dev-cafews-yabinx2.emea1.cis.trcloud]
Error: Could not retrieve catalog from remote server: SSL_connect returned=1 errno=0 state=error: certificate verify failed: [unable to get local issuer certificate for /CN=cdt-dev-cafews-yabinx2.emea1.cis.trcloud]
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run
Error: Could not send report: SSL_connect returned=1 errno=0 state=error: certificate verify failed: [unable to get local issuer certificate for /CN=cdt-dev-cafews-yabinx2.emea1.cis.trcloud]
一般这种情况就是由于某种原因没有认证没有成功，但它又不会重新认证了，所以就报这个错误，解决办法是到这个目录下/etc/puppetlabs/puppet，把生成的ssl文件夹给删除，让它重新生成一次key。如果生成一次还没有成功的话，你要看一下是不是其它地方的问题，然后，要重新重复上面的步骤，重新生成密钥。
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