CentOS 7 YUM 源配置修复文档
问题现象
CentOS 7 系统使用 yum 安装软件时出现错误：
[root@test conf.d]# yum makecache 已加载插件：fastestmirror, product-id, search-disabled-repos, subscription-manager This system is not registered with an entitlement server. You can use subscription-manager to register. Determining fastest mirrors One of the configured repositories failed (未知), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Run the command with the repository temporarily disabled yum --disablerepo=<repoid> ... 4. Disable the repository permanently, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable <repoid> or subscription-manager repos --disable=<repoid> 5. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true Cannot find a valid baseurl for repo: centos-sclo-sclo
解决方案
步骤1：清理现有仓库配置
进入仓库配置目录
cd /etc/yum.repos.d
备份所有现有仓库文件
mkdir -p backup_all
移动所有 .repo 文件到备份目录
mv *.repo backup_all/
验证备份结果
ls -la backup_all/
步骤2：下载阿里云镜像源
Linux服务器性能监控速查手册
一、磁盘IO监控命令
1. iostat - 磁盘IO统计
查看磁盘详细IO
iostat -x 1 3
只看IOPS
iostat -d 1 3
关键指标阈值：
- %util > 80% : IO使用率过高
- await > 20ms : IO延迟过高
- tps > 500 : IOPS过高（普通磁盘）
EasySearch安装部署
1. 环境准备
1.1 创建安装目录
# 创建基础目录 mkdir -p /data/middleware/easysearch mkdir -p /opt/java
1.2 下载并安装 Java 17
# 下载 OpenJDK 17（假设文件已上传到服务器） cd /opt tar -xzf openjdk-17.0.2_linux-x64_bin.tar.gz # 设置 Java 环境变量 echo 'export JAVA_HOME=/opt/jdk-17.0.2' >> /etc/profile echo 'export PATH=$JAVA_HOME/bin:$PATH' >> /etc/profile source /etc/profile
