MegaCli 安装和基本使用 下载RPM包wget http://mirror.cogentco.com/pub/misc/MegaCli-8.07.14-1.noarch.rpmMegaCli-8.07.14-1.noarch.rpm安装rpm -ivh MegaCli-8.07.14-1.noarch.rpm安装完，就会在/opt/下创建个MegaRAID目录，文件都在里面添加软连接ln -s /opt/MegaRAID/MegaCli/MegaCli64 /usr/bin/MegaCli查看帮助手册MegaCli -h查看raid 状态MegaCli -LdInfo -lAll -aALLState : Degraded（降级） State : Offline（离线） State : Optimal（正常） Number Of Drives : 2 RAID组包含2块磁盘。 查看硬盘数量以及有无损坏，有几行就是有几个硬盘MegaCli -PDList -aALL |grep "Firmware state"硬盘状态:Firmware state: Online, Spun Up 磁盘正常 Firmware state: Unconfigured(good), Spun Up 磁盘已安装，但未启用 Firmware state: Unconfigured(bad) 故障 Firmware state: Failed 故障 Firmware state: Rebuild 重建，一般在更换磁盘时显示查看硬盘所有信息MegaCli -PDList -aALL部分参数解释:Slot Number: ---硬盘槽号PD Type: -----磁盘接口类型InquiryData: -----硬盘的序列号、型号、固件版本Raw Size: -----磁盘原始大小NonCoerced Size: -----磁盘标准大小CoercedSize: ------磁盘最大可用大小Medai Error Count: ------表示磁盘可能错误，可能是磁盘有坏道，这个值不为0值得注意，数值越大，危险系数越高。Other Error Count: ------表示磁盘可能存在松动，可能需要重新再插入。Predictive Failure Count: -----预测故障计数查看raid级别第一种：MegaCli -LdPdInfo -aALL|grep "RAID Level"raid级别:RAIDLevel : Primary-0, Secondary-0, RAID Level Qualifier-0 这就是raid00 0 0 是raid01 0 0 是raid15 0 3 是raid51 3 0 是raid10raid1 还需要结合Span Depth的值来判断Span Depth : 2 表示共2个RAID1盘组做成了RAID10，1表示1个RAID1盘组还有一种情况：Primary-1， Secondary-3， RAID LevelQualifier-0 也是表示 RAID-10;也可以这么显示raid级别，输入就会返回，这种的基本准确第二种：MegaCli -ShowSummary -aALL|grep "RAID Level"如报一下错误[root@localhost MegaCli]# ./MegaCli64 -PDList -aALL ./MegaCli64: error while loading shared libraries: libncurses.so.5: cannot open shared object file: No such file or directory解决办法 ：安装libncurses.so.5yum install libncurses.so.5安装 libncurses.so.5 之后，如果还是报错，就安装 libncurses 相关软件包yum install libncurses*

centos7 安装donet 1. centos7-安装dotnet工具安装epel源[root@sonarqube config]# yum install epel-release -y 导入dotnet源 [root@sonarqube config]# rpm -Uvh https://packages.microsoft.com/config/rhel/7/packages-microsoft-prod.rpm 查找dotnet安装包 [root@sonarqube config]# yum search dotnet-sdk安装最新dotnet[root@sonarqube config]# yum -y install dotnet-sdk-6.0验证安装是否成功[root@sonarqube config]# dotnet --version 6.0.1022. dotnet build报错问题描述: linux下dotnet build 时候出现 .1.201/NuGet.targets(124,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json.解决方案解决: /etc/pki/tls/certs/ 下面少了证书 ca-certificates.crt 拷贝下面内容到证书里面-----BEGIN CERTIFICATE----- MIIGKjCCBRKgAwIBAgIQAqQdLHDmymcvfOktofoYODANBgkqhkiG9w0BAQsFADBE MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMR4wHAYDVQQDExVE aWdpQ2VydCBHbG9iYWwgQ0EgRzIwHhcNMjAwNTI2MDAwMDAwWhcNMjEwNDIxMTIw MDAwWjBqMQswCQYDVQQGEwJVUzETMBEGA1UECBMKV2FzaGluZ3RvbjEQMA4GA1UE BxMHU2VhdHRsZTEZMBcGA1UEChMQQW1hem9uLmNvbSwgSW5jLjEZMBcGA1UEAwwQ 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一次在CentOS系统单用户模式下使用passwd命令破密失败的案例 某次遇到需要进入系统的单用户模式进行破密操作，结果却显示如下：根据提示：Permission denied（缺少权限）此时查看/usr/bin/passwd 权限：正常情况下的权限应该是如下： [root@web ~]# ls -l /usr/bin/passwd -rwsr-xr-x root root Aug : /usr/bin/passwd [root@web ~]# 发现权限异常，需要修复命令的权限： chown root:root /usr/bin/passwd chmod u=rwx,go=rx,u+s /usr/bin/passwd 再次出现错误提示：原因&解决方法：上面我们执行的chmod命令，其底层实现是chattr命令，用此命的功能更为强大，甚至可以锁定文件，即使root用户也操作不了此文件。chattr是用来更改文件属性，lsattr可用来查看文件的属性，执行命令lsattr /webapps/.usr.ini便可以看到当前文件的属性；可以发现当前文件有个i属性，查阅命令帮助文档可以看到有i属性的文件是不能修改的，更不可被删除，即使是root用户也不可。既然知道了文件不能删除的原因是加了i属性，所以相应的解决方案就是把文件的i属性去除，然后再删除。lsattr查看相关命令和文件的文件属性：chattr -i 去除锁定的文件属性尝试再次修改权限，无报错说明执行成功，如有错误需要检查之前的操作是否有遗漏：chown root:root /usr/bin/passwd chmod u=rwx,go=rx,u+s /usr/bin/passwd再次尝试破解密码，执行成功，如有错误需要检查之前的操作是否有遗漏：echo “123456” | passwd --stdin root //修改密码touch /.autorelabel //让SELINUX生效，这一步一定不能少，不然不能重启

在浏览器中打开“只能用微信内置浏览器”打开的页面 1）chrome浏览器，或者chrome内核的浏览器(2345浏览器、360浏览器等等)2）按F12键，开启调试模式。3）Network选项卡中，点击右边竖着的三个点4）在菜单More tools里选择，Network conditions5）去掉Select automatically 前面的钩6）最下方的空格粘贴以下文字：Mozilla/5.0 (iPhone; CPU iPhone OS 5_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Mobile/9B176 MicroMessenger/4.3.2Mozilla/5.0 (Linux; Android 5.1; SM-G900P Build/LRX21T) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/33.0.0.0 Mobile Safari/537.36 MicroMessenger/6.0.0.54_r849063.501 NetType/WIFI7）按F5刷新页面，就能看见只能用微信内部打开的网页了…

硬盘在线扩容 linux的扩容自动将所有剩余空间都扩容第一步 扩容分区表SSH登陆服务器输入命令： df -TH ，获得数据盘相关信息，我们的机器是 /dev/vdb1 ；driver 为所需要扩容分区的磁盘名称；part 为所需要扩容分区的分区编号 1 ；growpart /dev/$driver $part；本服务器示例，可以直接复制使用于本公司服务器，注意1前面的空格:growpart /dev/vdb 1如果执行出现以下错误：问题主要是在 文件编码 的问题,解决办法如下，执行: LANG=en_US.UTF-8第二步 扩容文件系统：(1) ext文件系统，适合用本公司机器，可直接复制使用于本公司服务器:resize2fs /dev/vdb1(2) xfs文件系统，不适用于本公司机器:xfs_growfs /dev/vdb1第三步 重启系统即可。{dotted startColor="#ff6c6c" endColor="#1989fa"/}Windows扩容进入磁盘管理，选择数据盘。右键点击扩展券，选择容量