当 SSH 登录 IP 地址被冲突的服务器时：
一会可以正常 SSH 登录
一会会出现此服务器 SSH ecdsa 码变更的提示，此时以前做过的密钥登陆和以前的登陆密码都可能会失效
[CONTENT] System local ports batch occupation
Content One: Occupy system local ports manually
# startport=33000;endport=34000;for i in $(seq $startport $endport);do nc -lk $i &;done(Add: Take start port is 33000 and end port is 34000 as an example here)
Content Two: Release all ports which are opened manually (kill all nc command processes)
# for i in $(ps -aux | grep nc | grep '\-lk' | awk '{print $2}');do kill $i; done[排错] SLES 12 运行 yast lan 命令时，报错 “Details: Augeas parsing/serializing error: Iterated lens matched less than it should at /usr/share/augeas/lenses/dist/hosts.aug:23.12-.42:”
报错代码
Details: Augeas parsing/serializing error: Iterated lens matched less than it should at /usr/share/augeas/lenses/dist/hosts.aug:23.12-.42:分析
/etc/hosts 文件中最后 1 行没有以 “\n” 结尾
解决方法
# echo >> /etc/hosts参考文献
https://www.suse.com/zh-cn/support/kb/doc/?id=000019057
[命令] Linux 命令 env （显示所有环境变量）
# env[内容] /etc/resolv.conf 配置文件的 search 选项
内容一：测试 search 选项的配置
# cat /etc/resolv.conf
search eternalcenter.com local new
nameserver 8.8.8.8内容二：测试 search 选项
2.1 查询 zhumingyu
# host -a zhumingyu
Trying "zhumingyu.eternalcenter.com"
Trying "zhumingyu.local"
Trying "zhumingyu.new"
Trying "zhumingyu"
Host zhumingyu not found: 3(NXDOMAIN)
Received 102 bytes from 8.8.8.8#53 in 62 ms（补充：当查询 zhumingyu 时，也就是中间没有点 “.”，则默认会被视为查询主机名，会先依次把 eternalcenter.com、local 和 new 作为后缀添加到 zhumingyu 后进行查询，最后才查询 zhumingyu）
2.2 zhumingyu.com
# host -a zhumingyu.com
Trying "zhumingyu.com"
Received 31 bytes from 1.1.1.1#53 in 217 ms
Trying "zhumingyu.com.eternalcenter.com"
Trying "zhumingyu.com.local"
Trying "zhumingyu.com.new"
Host zhumingyu.com.new not found: 4(NOTIMP)
Received 35 bytes from 1.1.1.1#53 in 218 ms（补充：当查询 zhumingyu.com 时，也就是中间有 1 个点 “.”，则默认会被视为查询域名，会先查询 mingyuzhu.com，如果查询失败，则会先依次把 eternalcenter.com、local 和 new 作为后缀添加到 zhumingyu 后进行查询）
2.3 查询 zhumingyu.com.
# host -a zhumingyu.com.
Trying "zhumingyu.com"
Host zhumingyu.com not found: 4(NOTIMP)
Received 31 bytes from 1.1.1.1#53 in 204 ms
Received 31 bytes from 1.1.1.1#53 in 204 ms（补充：当查询 zhumingyu.com. 时，也就是末尾有 1 个点 “.”，默认会被视为查询域名，且只会查询这个域名。不会查询 search 里的每 1 项）