记录关于系统运维,虚拟化云计算,数据库,网络安全等各方面问题,
oracle sysaux表空间文件过大的处理方法 一般来讲除开业务数据存放的表空间,DBA要着重关注SYSTEM,SYSAUX,UNDO,TEMP表空间,SYSTEM表空间的大小一般是衡定的,UNDO和TEMP表空间的大小由数据库的业务情况决定,而SYSAUX表空间在默认条件下你如果不做任何配置,随着时间的推移,会膨胀的越来越大!SYSAUX表空间做为SYSTEM表空间的辅助表空间,主要存放EM相关的内容以及表统计信息,AWR快照,审计信息等,个人认为,如果你的SYSAUX表空间大小超过2G,那么该考虑让他减肥了!  一:使用下列语句查询表空间使用率  SELECT * FROM (  SELECT D.TABLESPACE_NAME,          SPACE || 'M' "SUM_SPACE(M)",          BLOCKS "SUM_BLOCKS",          SPACE - NVL ...
Mysql连接数过多,应急处理方法一、问题描述        今天突然接到个问题,网页报错:503 Service Temporarily Unavailable。经过查询发现是某个用户的连接超级多,已经将数据库连接占满。处理方案,即时杀掉堵塞的进程,之后可以扩大max_connections参数。二、处理方法1.查询连接情况root@localhost > show processlist;…...1001 rows in set (0.00 sec)root@localhost > show variables like '%proces%';Empty set (0.00 sec)2.检查参数root@localhost > show global status like 'Max_used_connections';+----------------------+-------+| Variable_name | Value |+----------------------+-------+| Max_used_connections | 1001 |+----------------------+-------+1 row in set (0.00 sec)3.通过命令生成杀进程脚本root@localhost > select concat('KILL ',id,';') from information_schema.processlist where user=’sam' into outfil...
MySql5.7 longtext表字段特殊字符插入与更新方法表zbp_post,最后一个字段如下图。最后一列 log_meta,有一行数据如下内容如下a:2:{s:28:"passwordvisit_enable_encrypt";s:1:"1";s:22:"passwordvisit_password";s:8:"8061";}此列是 longtext类型,使用以下方法更新,提示报错。update zbp_post set log_Meta=(SELECT log_Meta FROM zbp_post WHERE log_ID='2367') where log_Status='2'MySQL 返回: #1093 - You can't specify target table 'zbp_post' for update in FROM clause在phpmyadmin中,给字段写入数据后,提示命令如下:UPDATE `zbp_post` SET `log_Meta` = 'a:2:{s:28:\"passwordvisit_enable_encrypt\";s:1:\"1\";s:22:\"passwordvisit_password\";s:8:\"8061\";}' WHERE `zbp_post`.`log_ID` = 2366;看来特殊字符 "  / 之类的加转义字符\就可以在 mysql中执行命令了,但是不能在phpmyadmin中执行。
添加中科院 openEuler 镜像软件源添加 OS 软件源1,openEuler-RISCV版系统添加镜像源。注意:如在使用yum,wget 时,riscv-openEuler系统报ssl证书错误,那么注意检查系统时间与日期是否正常。[root@openEuler-RISCV-rare ~]# cat /etc/yum.repos.d/oe-rv.repo[base]name=basebaseurl=https://isrc.iscas.ac.cn/mirror/openeuler-sig-riscv/oe-RISCV-repoenabled=1gpgcheck=0[oe-noarch]name=oe-noarchbaseurl=https://isrc.iscas.ac.cn/mirror/openeuler-sig-riscv/oe-RISCV-repo/enabled=1gpgcheck=0openEuler 20.03 LTS执行以下命令cd /etc/yum.repos.d/ sudo curl -L -O https://mirror.iscas.ac.cn/mirror/openEuler-20.03-LTS-os.repo sudo dnf makecache openEuler 20.09执行以下命令cd /etc/yum.repos.d/ sudo curl -L -O https://mirror.iscas.ac.cn/mirror/openEuler-20.09-os.repo sudo dnf makecache 添加 Everything 软件源openEuler 20.03 LTS执行以下命令cd /etc/yum.repos.d/ sudo curl -L -O https://mirror.iscas.ac.cn/mirror/openEuler-20.03-LTS-everything.repo sudo dnf makecache openEuler 20.09cd /etc/yum.repos.d/ sudo curl -...
QEMU (简体中文)Jump to navigationJump to search相关文章Category:Hypervisors (简体中文)Libvirt (简体中文)QEMU/Guest graphics accelerationPCI passthrough via OVMF (简体中文)翻译状态:本文是 QEMU 的翻译。上次翻译日期:2020-11-8。如果英文版本有所更改,则您可以帮助同步翻译。来自 QEMU 关于页面:“Qemu”是一个广泛使用的开源计算机模拟器和虚拟机。"当作为模拟器时,可以在一种架构(如x86 PC)下运行另一种架构(如ARM)下的操作系统和程序。通过使用动态转换,它可以获得非常好的性能。作为虚拟机时,QEMU可以使用其他虚拟机管理程序(如 Xen 或 KVM)来使用CPU扩展(HVM)进行虚拟化,通过在主机CPU上直接执行客户机代码来获得接近于宿主机的性能。Contents1安装1.1QEMU 变种1.2Arch Linux中相关安装包的详细信息2QEMU 的图形前端3创建新虚拟系统3.1创建硬盘镜像3.1.1上层存储镜像3.1.2调整镜像大小3.2准备安装介质3.3安装操作系统4运行虚拟化的系统4.1启用 KVM4.2启用 IOMMU (Intel VT-d/AMD-Vi) 的支持5宿主机和虚拟机数据交互5.1网络5.2QEMU 端口转发5.3QEMU 的内置SMB服务器5.4使用直通式文件系统和VirtFS5.5在宿...
Toad For Oracle 2020R2 v14.0.75.662下载国外地址,最好翻墙。https://uploadgig.com/file/download/aA5129d9d0e8369a/uy0z6.Toad.for.Oracle.2020.Edition.v14.0.75.662.x64.rar https://uploadgig.com/file/download/5D168dfc077e0Db5/uy0z6.Toad.for.Oracle.2020.Edition.v14.0.75.662.x86.rar Rapidgator https://rapidgator.net/file/358435246603c41bfa8dab753307b4e1/uy0z6.Toad.for.Oracle.2020.Edition.v14.0.75.662.x64.rar.html https://rapidgator.net/file/1e1534bfefd4aea1cdf9158f82673740/uy0z6.Toad.for.Oracle.2020.Edition.v14.0.75.662.x86.rar.html NitroFlare http://nitroflare.com/view/96196343BD5713A/uy0z6.Toad.for.Oracle.2020.Edition.v14.0.75.662.x64.rar http://nitroflare.com/view/DA8382BC23D58B9/uy0z6.Toad.for.Oracle.2020.Edition.v14.0.75.662.x86.rar
openEuler RISC-V 移植版的获取和运行介绍本文档介绍如何获取和运行openEuler RISC-V移植版。环境需求QEMU 模拟器环境操作系统:x86_64/aarch64 LinuxQEMU 版本:>= 4.0.0, <=5.0获取openEuler RISC-V 移植版系统镜像在openEuler官网可以获得openEuler RISC-V移植版发布的最新版本的openEuler RISC-V镜像以及repo源https://openeuler.org/zh/download/其中的两个文件是启动openEuler RISC-V 移植版所必需的:fw_payload_oe.elf 利用openSBI将kernel-5.5的image作为payload所制作的用于QEMU启动的imageopenEuler-preview.riscv64.qcow2 openEuler RISC-V移植版的rootfs镜像还可以从以下网址获取到openEuler RISC-V之前的版本以及repo源https://isrc.iscas.ac.cn/mirror/openeuler-sig-riscv/其中fw_payload_oe.elf 利用openSBI将kernel-5.5的image作为payload所制作的用于QEMU启动的imageoe-rv-rv64g-30G.qcow2 openEuler RISC-V移植版的rootfs镜像通过QEMU启动一个openEuler RISC-V首先你需要在你的host Linux环境中有 qemu-system-riscv64 的二进制程序,如果你的Linux环境的repo源中没有提供这个二进制,那么则需要手动从QEMU的源码构建出来,具体的构建方式如QEMU的...
How to install Ubuntu Server for Arm in a QEMU aarch64 virtual machineQEMU 模拟 aarch64虚拟机中安装ubuntu arm版系统Follow the steps below to install Ubuntu Server 20.04 on a QEMU aarch64 (Armv8) virtual machine from the Linux command line. The x86 host system was running Ubuntu 18.04.  The virtual machine uses UEFI boot firmware.Ubuntu Server is console based and so everything in these steps uses a console and no GUI.  I may show the steps for Ubuntu desktop with a GUI in a future post.Prerequisites1. Install QEMU$ sudo apt-get install qemu-system-arm2. Install a pre-built UEFI image for QEMU$ sudo apt-get install qemu-uefi3.  Download an Ubuntu distro install ISO image.   In this example we are using the Server variant of Ubuntu.   You can find 20.04 release images here: http://cdimage.ubuntu.com/ubuntu/releases/20.04/release/ $ wget -O ubuntu-20.04-live-server-arm64.iso http://cdimage.ubuntu.com/ubuntu/releases/20.04/release/ubuntu-20.04-live-serve...
 
0

QEMU模板ARM环境

发表者:admin分类:云计算容器2020-12-23 12:14:41 阅读[253]
QEMU ARM guest supportQEMU模板ARM环境与支持硬件开发板QEMU has generally good support for ARM guests. It has support for nearly fifty different machines. The reason we support so many is that ARM hardware is much more widely varying than x86 hardware. ARM CPUs are generally built into "system-on-chip" (SoC) designs created by many different companies with different devices, and these SoCs are then built into machines which can vary still further even if they use the same SoC. Even with fifty boards QEMU does not cover more than a small fraction of the ARM hardware ecosystem.Because ARM systems differ so much and in fundamental ways, typically operating system or firmware images intended to run on one machine will not run at all on any other. This is often surprising for new users who are used to the x86 world where every system looks like a standard PC. (Once the kernel has booted, most userspace software cares much less about the detail of the hardware.)The situation for 64-...
Installing Debian on QEMU’s 32-bit ARM “virt” boardQEMU模拟32位 ARM virt开发板并安装debian系统。 In this post I’m going to describe how to set up Debian on QEMU emulating a 32-bit ARM “virt” board. There are a lot of older tutorials out there which suggest using boards like “versatilepb” or “vexpress-a9”, but these days “virt” is a far better choice for most people, so some documentation of how to use it seems overdue. (I may do a followup post for 64-bit ARM later.)Update 2017-07-24: I have now written that post about installing a 64-bit ARM guest.Why the “virt” board?QEMU has models of nearly 50 different ARM boards, which makes it difficult for new users to pick one which is right for their purposes. This wild profusion reflects a similar diversity in the real hardware world: ARM systems come in many different flavours with very different hardware components and capabilities. A kernel which is expecting to run on one system will likely not run on a...
    总共238页,当前第15页 | 页数:
  1. 5
  2. 6
  3. 7
  4. 8
  5. 9
  6. 10
  7. 11
  8. 12
  9. 13
  10. 14
  11. 15
  12. 16
  13. 17
  14. 18
  15. 19
  16. 20
  17. 21
  18. 22
  19. 23
  20. 24
  21. 25