我刚刚创建了一个 Ubuntu 服务器。我尝试安装 Nginx，但出现错误。
root@scw-eefca0:~# sudo apt-get install nginx
Reading package lists... Done
Building dependency tree
Reading state information... Done
nginx is already the newest version (1.10.0-0ubuntu0.16.04.4).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
Setting up nginx-core (1.10.0-0ubuntu0.16.04.4) ...
Job for nginx.service failed because the control process exited with error …我正在尝试从机器 A 复制文件：
apt policy openssh-client
openssh-client:
Installiert: 1:7.2p2-4ubuntu2.4
到机器 B：
apt-cache policy openssh-client
openssh-client:
Installiert: 1:5.5p1-6+squeeze5
在 A：
scp myfile <server>:/myfile
md5sum myfile
2ba67c5e816350d4d2e2e7fd883037e7
file myfile
myfile: Python script, ASCII text executable
在 B 上：
md5sum myfile
8883620c2a0878da1db273101b55124d
file myfile
myfile: ASCII Java program text
查看文本文件，似乎每一行都比最后一行多一个空格，所以不是：
import argparse, os, sys
from subprocess import check_output
def count_voicemails(dir):
# find is faster than ls, since it does not check attributes
command = 'find {}/INBOX -maxdepth 1 | wc -l'
count = …我已经为 puppet 建立了一个测试实验室，但它不起作用。我puppet agent在节点上启动并等待证书。
root:~# puppet agent --server xxxx --waitforcert 60 --test
warning: peer certificate won't be verified in this SSL session
warning: peer certificate won't be verified in this SSL session
warning: peer certificate won't be verified in this SSL session
在服务器上，现在找到挂起的证书请求：
root:~# puppet cert --list
root:~#
在 masterhttpd 日志中：
root:~# tail /var/log/puppet/masterhttp.log
[2012-01-06 09:19:17] xxx - - [06/Jan/2012:09:19:17 CET] "GET /production/certificate/xx HTTP/1.1" 404 30
[2012-01-06 09:19:17] - -> /production/certificate/pgw
[2012-01-06 09:19:47] xxx - - [06/Jan/2012:09:19:47 CET] …我熟悉设置 RAID 阵列，并且正在我的家庭环境中运行一些。
我想知道是否可以在故障转移配置中拥有多个存储服务器。
我希望通过这个实现的是对这些服务器有一定的冗余。当一台服务器出现故障时，可以完全更换它而不会丢失数据。我的意思不仅仅是磁盘故障，而是更严重的事情。可能是 BIOS 损坏。我以前吃过那些……不漂亮。
实现这一目标的最佳方法是什么，我必须如何设置它？