……Totaldownloadsize:44MIsthisok[y/N]:y3. After the installation is complete, verify that[[emailprotected]~]#java-versionjavaversion"1.6.0_37"OpenJDKRuntimeEnvironment(IcedTea61.13.9)(rhel-1.13.9.4.el5_11-x86_64)OpenJDK64-BitServerVM(build23.25-b01,mixedmode)4. The path to the default installation via Yum is/usr/lib/jvm[[emailprotected]~]#cd/usr/lib/jvm[[emailprotected]jvm]#lltotal24drwxr-xr-x3rootroot4096Jan1220:01java-1.6.0-openjdk-1.6.0.37.x86_64lrwxrwxrwx1rootroot21Jan1220:01jre->/etc/
This article classifies software and hardware attacks on the xen platform, and provides simple attack methods for each type of attacks. In fact, hackers, viruses, and other attack methods are far more than that, this section only summarizes some common attack methods.
The first is to summarize the hardware security threats on the xen platform.
L CPU threats: 1) the attacker updates and modifies the microcode through the microcode of the CPU. As a result, the CPU executes the command to assum
. Enter the following command on the terminal:
Sudo update-alternatives -- install/usr/bin/gcc/usr/bin/gcc-4.4 40
Sudo update-alternatives -- install/usr/bin/gcc/usr/bin/gcc-4.1 30
Set the default GCC version. Run the following command:
Sudo update-alternatives -- config gcc
Result:
There are 2 choices for the alternative gcc (providing/usr/bin/gcc ).Se
, and then adding 13 virtual CPUs to the virtual machine to reach a total of 17 virtual CPUs, how does Numa equalize? is technically possible, but unless the VM resides on a physical machine that has a larger number of CPU sockets than the physical CPU core, it can cause performance degradation across NUMA due to memory addressing. Therefore, the Vnuma extension is not enabled, regardless of whether you enable any form of hot-add CPU or hot-add memory. And you are likely to affect existing SQL S
GCC is the GNU exclusive C/C ++ compiler. Because GCC has compatibility issues, you must use the specified version of GCC to compile and pass the code, therefore, we should switch to the appropriate GCC compiler in a timely manner.
1. Brief description:In general, the Compilation Program uses:/usr/bin/GCC
In fact, this/usr/bin/GCC is just a symbolic link, it points to/etc/alternatives/GCC, and/etc/alternatives
mockobjects-jdk1.4.x86_64:mockobjects for 1.4 jdk
2. Install JDK
[Root@localhost ~]# yum install java-1.6.0-openjdk.x86_64 ...
Total download size:44 M are this
OK [y/n]: Y
3. After the installation is complete, verify
[Root@localhost ~]# java-version
java Version "1.6.0_37"
OpenJDK Runtime (Environment IcedTea6) ( rhel-1.13.9.4.el5_11-x86_64)
OpenJDK 64-bit Server VM (build 23.25-b01, Mixed mode)
4. The default installation path via Yum is
/usr/lib/jvm
[
RDMA (remote direct memory access) is short for remote memory direct access technology. It features high bandwidth, low latency, zero copy, operating system bypass, and cpu uninstallation. RDMA implementation requires specific hardware support, mainly including Infiniband, iWARP and RoCE. RDMA technology is often used in high-performance computing (HPC), cluster databases, financial systems, distributed environments, and big data.
This article mainly introduces the RDMA solution of VMware virtua
The Hyper-V hypervisor will finally meet you with the launch of the latest RC1 version. Microsoft is also switching from the Main Engineering Operation Model to cross-the-I's and dot-the-t's meticulous attention to details. Hyper-V subjects, including a large list of supported operating systems, are currently ready. Microsoft users can confidently migrate their test VMS to the trial-run hypervisor.
However,
First, virtualization Hypervisor Meta-systemHypervisoris an intermediate software layer running between the physical server and the operating system, allows multiple operating systems and applications to share a set of basic physical hardware , and therefore can also be viewed as a virtual environment "Yuan"Operating System, it can coordinate access to all physical devices and virtual machines on the server, also called virtual machine monitors (Virtu
ID of the last processor is 0, then the number of CPUs is 1, so it is 1 CPU * dual-core
Another example:
processor : 0vendor_id : AuthenticAMDcpu family : 16model : 8model name : AMD Opteron(tm) Processor 4171 HEstepping : 1cpu MHz : 2094.686cache size : 512 KBphysical id : 0siblings : 4core id : 0cpu cores : 4apicid : 0initial apicid : 0fpu : yesfpu_exception : yescpuid level : 5wp
and hypervisor, as well as the hypervisor and host architectures.
The simplest way to achieve full virtualization is to provide a virtual network interface for the guest operating system. The hypervisor then intercepts the virtual machine's Accesses (to critical resources), and uses a module to simulate the hardware functions (emulator) of the NIC ). This method
Technology Research points of measurement technology under the virtualization architecture. 1. The measurement content and scope are greatly expanded. Traditional measurement methods are used to measure program files, code images, kernel modules, kernel data variables, and program memory pages. In a hypervisor-based system, you can measure system calls, interruptions, exceptions, and other events. When these events occur, You can dynamically measur
page containing app1 data) to domain0 through the event channel; back-end read request, obtain the physical address of the page and send it to the response driver;
4. xen removes the domain2 request from the sharing descriptor ring, moves the request consumer pointer, and schedules domain1;
5. The front end of domain1 fills in the IO loop with a pointer pointing to the free page in the grant table to receive the request;
6. when the back-end receives the data report, it first checks who the dat
virtual machines. Libvirt
Finally, let's take a look at libvirt.
Libvirt is relatively simple. It is a unified virtualization management interface. Currently, the following virtualization implementations are supported:
The KVM/qemu Linux hypervisor
The xen hypervisor on Linux and Solaris Hosts.
The lxc Linux container system
The openvz Linux container system
The user mode Linux paravirtualized Kernel
Create
(
pool=none
)
Create (allocate) a floating IP for a tenant
Delete
(
floating_ip
)
Delete (deallocate) a floating IP for a tenant
Parameters:
floating_ip , haven floating IP address to delete.
Get
available hypervisor. libvirtexposes an application programming interface (API) that integrates with a large number of open-source hypervisors for control and monitoring. libvirtprovides a daemon named to libvirtd Help implement control and monitoring (as shown in a simple stack below).Figure 1. A simple representation of the Virt-manager stack containing QEMUVirtual Machine Manager is developed by Red Hat using the Python language to control the lif
Ubuntu GNU/Linux 12.04 lts (precise pangolin) released. I wanted to manually install the Sun JDK 6 and 7 on Ubuntu.
Installing Sun JDK 6 on Ubuntu 12.04:
Download the Sun JDK 6 BinFrom here.
Make the BIN file executeable:
chmod +x jdk-6u32-linux-x64.bin
Extract the BIN file:
./jdk-6u32-linux-x64.bin
Move extracted folder to this location:
sudo mv jdk1.6.0_32 /usr/lib/jvm/
Install new Java source in system:
sudo update-alternatives --ins
you have configured the relevant parameters, remember to restart Zabbix server. you may have noticed Although both vmwarefrequency and vmwareperffrequency are definitions of how often data is collected, there are some differences between the two parameters. Zabbix from the 2.4.4 version, the data collected from VMware is divided into two categories:vmwareconfiguration data(configuration) and Vmwareperformance counter Data(performance counter statistics), which are collected through VMware coll
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