January, 2015
GHOST: glibc: buffer overflow
A serious vulnerability was discovered, and was baptized GHOST in GNU/Linux. It’s present in all Red Hat Enterprise Linux versions, (CentOS etc.), and Debian systems. Affected versions: RHEL(Red Hat Enterprise Linux) version 6.x and 7.x CentOS Linux version 6.x & 7.x Ubuntu Linux version 10.04, 12.04 LTS Debian Linux version 7.x Linux Mint version 13.0 SUSE Linux Enterprise 11 and older (also OpenSuse Linux 11 or older versions). Arch Linux glibc version <= 2.18-1 It’s strongly recommended update glibc What services are using this library? Run this command to discoverRead More
Checking vSphere Flash Read Cache
Sometimes we need to check that everything is working fine with SSD. In order to check that, first connect to esxi via ssh ~ # esxcli storage vflash cache list vfc-1540989573-server.xxxxxxxx-000001 # esxcli storage vflash cache stats Usage: esxcli storage vflash cache stats {cmd} [cmd options] Available Commands: get Get vflash cache statistics. reset Reset vflash cache statistics. In this case vfc-1540989573-server.xxxxxxxx-000001 is the virual machine id Now we’ll use: # esxcli storage vflash cache stats # esxcli storage vflash cache stats get Error: Missing required parameter -c|–cache-name Usage:Read More
esxcli Connect to localhost failed:
This issue may occur either because has lost the session between esxi with vCenter or because the password is not the same in vCenter Symptoms Esxcli is too slow, or receive this error …Connect to localhost failed: Cannot complete login due to an incorrect user name or password. ~ # esxcli Connect to localhost failed: Cannot complete login due to an incorrect user name or password. To resolve the issue: 1.Righ click and Disconnect the host from vCenter Server. (Do not remove it). 2.Righ click and reconnectingRead More
SSD not available for VMware vSphere Flash Read Cache
First, in order to detect Network Address Authority (naa) identifier of the SSD run de following commands: # esxcli storage nmp device list|less or # esxcfg-scsidevs -l | less or #esxcli storage core device list|less If you detect the following Is SSD: false <– Not recognized as SSD Run these commands: # esxcli storage nmp satp rule add –satp=VMW_SATP_LOCAL –device naa.600304801axxxx –option “enable_local enable_ssd” # esxcli storage core claimrule load # esxcli storage core claiming reclaim -d naa.XXXXXXX # esxcli storage core claimrule run And try again. IF YOU ALREADYRead More
Upgrading a virtual machine to the latest hardware version in VMware esxi
The previous step are: 1. Be sure you have the same build version in esxi host. If not, run a scan with Update Manager and update all important patches 2. Upgrade Vmware Tools, because might lose network settings if they are not on the latest version 2. Take a Snapshot before upgrade hardware version Start Vsphere Client or Vsphere Web and log in vCenter Server Client and perform a power off Right Click In the vSphere Client, the option is Upgrade Virtual Hardware. In the vSphere Web Client, the optionRead More
request entity is too large
If you have this error, the page was not displayed because the request entity is too large or HTTPS 413: The page was not displayed because the request entity is too large. You can fix it running this command appcmd.exe set config -section:system.webserver/serverruntime/uploadreadaheadsize: 1048576 /commit:apphost Other way to solve that: 1) Enter to IIS and select the site under Default Web Site 2) Select Configuration Editor 3) Within Section Dropdown, select “system.webServer/serverRuntime” 4) Enter a higher value for “uploadReadAheadSize” Default is very low something like 49152 bytes.
Automatic Virtual Machine Activation
Automatic Virtual Machine Activation
Automatic Virtual Machine Activation (AVMA) acts as a proof-of-purchase mechanism, helping to ensure that Windows products are used in accordance with the Product Use Rights and Microsoft Software License Terms. System Requirements AVMA only requires a virtualization server running Windows Server 2012 R2 Datacenter. The guest virtual machine operating system must be Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard, or Windows Server 2012 R2 Essentials. How to implement AVMA Run this command slmgr /ipk <AVMA_key> The following AVMA keys can be used for Windows Server 2012 R2. EditionRead More
Esxi – NFS Tuning
Set these values: Under NFS, Select NFS.MaxVolumes: ESXi 5.0/5.1/5.5: Set NFS.MaxVolumes to 256 Under Net, Select Net.TcpipHeapSize: The amount of heap memory, measured in megabytes, which is allocated for managing VMkernel TCP/IP network connectivity. When increasing the number of NFS datastores, increase the default amount of heap memory as well: ESXi 5.0/5.1/5.5: Set Net.TcpipHeapSize to 32 Under Net, Select Net.TcpipHeapMax: The maximum amount of heap memory, measured in megabytes, which can be allocated for managing VMkernel TCP/IP network connectivity. When increasing the number of NFS datastores, increase the maximum amount of heapRead More