Centos7 ping: www.baidu.com: Name or service not known的问题
春节复工之后，再次登录服务器。服务器的ip被改动了。
不知道是何原因，conda update --all指令和git clone 指令都用不了了。
[xl@GPU1 ~]$ conda update --all
Collecting package metadata (current_repodata.json): failed
#>>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<
Traceback (most recent call last):
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/exceptions.py", line 1078, in __call__
return func(*args, **kwargs)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/cli/main.py", line 84, in _main
exit_code = do_call(args, p)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/cli/conda_argparse.py", line 82, in do_call
exit_code = getattr(module, func_name)(args, parser)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/cli/main_update.py", line 20, in execute
install(args, parser, 'update')
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/cli/install.py", line 265, in install
should_retry_solve=(_should_retry_unfrozen or repodata_fn != repodata_fns[-1]),
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/solve.py", line 117, in solve_for_transaction
should_retry_solve)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/solve.py", line 158, in solve_for_diff
force_remove, should_retry_solve)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/solve.py", line 262, in solve_final_state
ssc = self._collect_all_metadata(ssc)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/common/io.py", line 88, in decorated
return f(*args, **kwds)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/solve.py", line 415, in _collect_all_metadata
index, r = self._prepare(prepared_specs)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/solve.py", line 1004, in _prepare
self.subdirs, prepared_specs, self._repodata_fn)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/index.py", line 229, in get_reduced_index
repodata_fn=repodata_fn)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/subdir_data.py", line 105, in query_all
result = tuple(concat(executor.map(subdir_query, channel_urls)))
File "/home/xl/anaconda2/lib/python2.7/site-packages/concurrent/futures/_base.py", line 641, in result_iterator
yield fs.pop().result()
File "/home/xl/anaconda2/lib/python2.7/site-packages/concurrent/futures/_base.py", line 462, in result
return self.__get_result()
File "/home/xl/anaconda2/lib/python2.7/site-packages/concurrent/futures/thread.py", line 63, in run
result = self.fn(*self.args, **self.kwargs)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/subdir_data.py", line 98, in <lambda>
package_ref_or_match_spec))
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/subdir_data.py", line 110, in query
self.load()
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/subdir_data.py", line 174, in load
_internal_state = self._load()
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/subdir_data.py", line 248, in _load
repodata_fn=self.repodata_fn)
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/core/subdir_data.py", line 587, in fetch_repodata_remote_request
""") % maybe_unquote(repr(e))
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/common/url.py", line 368, in maybe_unquote
return unquote_plus(remove_auth(url)) if url else url
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/common/url.py", line 372, in remove_auth
url_parts = parse_url(url)._asdict()
File "/home/xl/anaconda2/lib/python2.7/site-packages/conda/_vendor/urllib3/util/url.py", line 196, in parse_url
raise LocationParseError(url)
LocationParseError: Failed to parse: ConnectionError(MaxRetryError("HTTPSConnectionPool(host='mirrors.tuna.tsinghua.edu.cn', port=443): Max retries exceeded with url:
`$ /home/xl/anaconda2/bin/conda update --all`
environment variables:
CIO_TEST=<not set>
CLASSPATH=.:/usr/java/jdk1.8.0_151/lib/dt.jar:/usr/java/jdk1.8.0_151/lib/tools.j
ar:/usr/java/jdk1.8.0_151/jre/lib
CONDA_EXE=/home/xl/anaconda2/bin/conda
CONDA_PYTHON_EXE=/home/xl/anaconda2/bin/python
CONDA_ROOT=/home/xl/anaconda2
CONDA_SHLVL=0
LD_LIBRARY_PATH=/usr/local/cuda-9.0/lib64:/usr/local/cuda-9.0/extras/CUPTI/lib64:/usr/
local/lib/openmpi:/usr/local/cuda-9.0/lib64:/home/xl/anaconda2/lib
MODULEPATH=/usr/share/Modules/modulefiles:/etc/modulefiles
PATH=/home/xl/anaconda2/bin:/home/xl/anaconda2/condabin:/usr/local/cuda-9.0
/bin:/root/anaconda3/bin:/usr/java/jdk1.8.0_151/bin:/usr/java/jdk1.8.0
_151/jre/bin:/home/softwarePlatform/Dev_Platform/hadoop3/bin:/usr/loca
l/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/xl/.local/bin:/home/xl/
bin
PYTHONPATH=/home/xl/usr/bin/python3:/home/xl/ssd_caffe/python:/home/xl/caffe/pyth
on:/home/xl/ssd-caffe/python::/usr/local/lib/python2.7/dist-
packages/models:/usr/local/lib/python2.7/dist-packages/models
REQUESTS_CA_BUNDLE=<not set>
SSL_CERT_FILE=<not set>
active environment : None
shell level : 0
user config file : /home/xl/.condarc
populated config files : /home/xl/.condarc
conda version : 4.8.0
conda-build version : 3.18.9
python version : 2.7.16.final.0
virtual packages : __glibc=2.17
__cuda=9.0
base environment : /home/xl/anaconda2 (writable)
channel URLs : https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/linux-64
https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/noarch
https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/linux-64
https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/noarch
https://repo.anaconda.com/pkgs/main/linux-64
https://repo.anaconda.com/pkgs/main/noarch
https://repo.anaconda.com/pkgs/r/linux-64
https://repo.anaconda.com/pkgs/r/noarch
package cache : /home/xl/anaconda2/pkgs
/home/xl/.conda/pkgs
envs directories : /home/xl/anaconda2/envs
/home/xl/.conda/envs
platform : linux-64
user-agent : conda/4.8.0 requests/2.22.0 CPython/2.7.16 Linux/3.10.0-1062.1.2.el7.x86_64 centos/7.7.1908 glibc/2.17
UID:GID : 1004:1004
netrc file : None
offline mode : False
An unexpected error has occurred. Conda has prepared the above report.
If submitted, this report will be used by core maintainers to improve
future releases of conda.
Would you like conda to send this report to the core maintainers?
[y/N]:
No report sent. To permanently opt-out, use
$ conda config --set report_errors false
推测网络连接出现问题。
于是，通过ping指令进行验证：
果然是网络不通。上网查了一下，最终得到解决：
1.查看网络配置
按照centos7 ping: www.baidu.com: Name or service not known这篇博客中的提供方案，首先需要查看下系统的ip、子网掩码和网关等信息。
查到ip为：
子网掩码和网关为：
2.编辑Linux中的网络配置文件
配置文件在/etc/sysconfig/network-scripts/目录下，网络配置文件名可能会有不同。我的网络配置文件ifcfg-em3，有人的是ifcfg-ens33
其原来的内容如下：
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=em3
UUID=2ac0a65c-1e6d-401c-8691-9342907d49a2
DEVICE=em3
ONBOOT=yes #网络设备开机启动
IPADDR=192.168.1.181
PREFIX=24
GATEWAY=192.168.10.1 #网关IP
DNS1=114.114.114.114
DNS2=8.8.8.8
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
发现
ONBOOT=yes #网络设备开机启动是对的
IPADDR=192.168.1.181与我的主机ip也是相符的
默认网关GATEWAY=192.168.10.1不对，我的实际的默认网关是192.168.1.1
修改GATEWAY=192.168.1.1
3.重启网络服务
service network restart
4.测试一下
可以了!
OK 搞定！
5.DNS文件配置
上面我的网络配置文件ifcfg-em3中
DNS1=114.114.114.114
DNS2=8.8.8.8
与我的/etc/resolv.conf文件中的
nameserver 114.114.114.114
nameserver 8.8.8.8
一致且可行，没有修改为
和
这里做一下说明。
参考网址
【1】centos7 ping: www.baidu.com: Name or service not known
【2】centos7 ping: www.baidu.com: Name or service not known