Re: [CentOS] Squid as interception HTTPS proxy under CentOS 7

Hey There, I think it would be better asked at squid-users list: - http://www.squid-cache.org/Support/mailing-lists.html#squid-users - squid-us...@lists.squid-cache.org Eliezer Croitoru On 04/02/2016 15:24, C. L. Martinez wrote: Hi all, I am trying to configure squid as a interception

Re: [CentOS] "upstream testing"??

On 2/7/2016 1:00 PM, Bear Tooth wrote: So I put in an install disk for CentOS, and rebooted. It never came near finishing the reboot. Up popped the following: what version of centos was this? you previously mentioned 6.4, thats like 3-4 updates behind the

Re: [CentOS] "upstream testing"??

Which System76 model? How is the install media created? Presumably it's a USB stick, but how is it being created? The easiest and most reliable is to use dd. Livecd-tools is also reliable but has a number of options required to boot UEFi systems. LiveUSB Creator should work. Everything else is

Re: [CentOS] Utility to zero unused blocks on disk

On 09/02/16 12:24 AM, g wrote: > > > On 02/08/16 23:10, Digimer wrote: >> On 09/02/16 12:08 AM, g wrote: >>> >>> >>> On 02/08/16 15:34, Wes James wrote: Is there a utility to zero unused blocks on a disk? CentOS 6.7/Ext4 I saw zerofree, but I’m not sure it would work on

Re: [CentOS] Utility to zero unused blocks on disk

On Mon, Feb 8, 2016 at 10:54 PM, Chris Murphy wrote: > Secure erase is really the only thing to use on SSDs. Oops. It's probably a fairly close approximation to just mkfs.btrfs -f (or xfs) the entire block device for the SSD. If the kernel sees it as non-rotational,

Re: [CentOS] Utility to zero unused blocks on disk

On 02/08/16 15:34, Wes James wrote: > Is there a utility to zero unused blocks on a disk? > > CentOS 6.7/Ext4 > > I saw zerofree, but I’m not sure it would work on Ext4 or even work on > this version of CentOS. > > thanks, > . a comment on replies to your post. i find it interesting that

Re: [CentOS] Utility to zero unused blocks on disk

On 09/02/16 12:08 AM, g wrote: > > > On 02/08/16 15:34, Wes James wrote: >> Is there a utility to zero unused blocks on a disk? >> >> CentOS 6.7/Ext4 >> >> I saw zerofree, but I’m not sure it would work on Ext4 or even work on >> this version of CentOS. >> >> thanks, >> > . > a comment on

Re: [CentOS] Utility to zero unused blocks on disk

On 02/08/16 23:10, Digimer wrote: > On 09/02/16 12:08 AM, g wrote: >> >> >> On 02/08/16 15:34, Wes James wrote: >>> Is there a utility to zero unused blocks on a disk? >>> >>> CentOS 6.7/Ext4 >>> >>> I saw zerofree, but I’m not sure it would work on Ext4 or even work on >>> this version of

Re: [CentOS] Utility to zero unused blocks on disk

On Mon, Feb 8, 2016 at 3:18 PM, wrote: > Chris Murphy wrote: >> DBAN is obsolete. NIST 800-88 for some time now says to use secure erase >> or enhanced security erase or crypto erase if supported. >> >> Other options do not erase data in remapped sectors. > > dban doesn't? What

Re: [CentOS] Utility to zero unused blocks on disk

On 02/08/2016 07:04 PM, Chris Adams wrote: Once upon a time, Greg Bailey said: Wes didn't say the reason he wanted to zero unused blocks, but I always do this in kickstart scripts when constructing VM images as the image size is considerably reduced by doing this... For

Re: [CentOS] Utility to zero unused blocks on disk

Once upon a time, Robert Nichols said: > On 02/08/2016 07:04 PM, Chris Adams wrote: > >For that purpose, use something that can TRIM a VM image, like > >virt-sparsify. > > That's doing the same thing. > > virt-sparsify works by mounting the filesystem, filling it to

Re: [CentOS] Utility to zero unused blocks on disk

On 2/8/2016 9:54 PM, Chris Murphy wrote: Secure erase is really the only thing to use on SSDs. Writing a pile of zeros just increases wear (minor negative) but also doesn't actually set the cells to the state required to accept a new write, so you've just added a lot more work for the SSD's

Re: [CentOS] Squid as interception HTTPS proxy under CentOS 7

On Thu 4.Feb'16 at 20:24:58 +0200, Eero Volotinen wrote: > check out sslbump documentation: > http://wiki.squid-cache.org/Features/SslBump > > -- > Eero > I have changed my ssl-bump options to "ssl_bump server-first all" only, but nothing ... It doesn't works. Any more idea?? -- Greetings,

[CentOS] Seeking Clarification CentOS 7 as Samba 4 Active Directory Domain Controller

I performed a Samba 4 Active Directory Domain Controller install in June of 2015 on CentOS 7. At that time I used the Samba 4.1.XX package from SerNet due to the absence of necessary heimdal packages and libraries not provided in the CentOS 7 Samba package. Since the the 4.1 series is on security

Re: [CentOS-virt] KVM

>>> If you run top what are you seeing on the %Cpu(s) line? http://i.hizliresim.com/NrmV9Y.png On Mon, Feb 8, 2016 at 10:53 PM, Alvin Starr wrote: > You need to provide more information. > 20% is what number. > There are something like 6 numbers on that line. > > > On

Re: [CentOS-virt] KVM

Am 08.02.2016 um 22:25 schrieb Gokan Atmaca: If you run top what are you seeing on the %Cpu(s) line? http://i.hizliresim.com/NrmV9Y.png That's not a CentOS system. You should probably consult the community providing support for your Debian or Ubuntu based system. I see you run MySQL, so

[CentOS] Utility to zero unused blocks on disk

Is there a utility to zero unused blocks on a disk? CentOS 6.7/Ext4 I saw zerofree, but I’m not sure it would work on Ext4 or even work on this version of CentOS. thanks, -wes ___ CentOS mailing list CentOS@centos.org

Re: [CentOS] Utility to zero unused blocks on disk

Personally, I just do 'dd if=/dev/zero of=/path/to/zero.img bs=1M; rm -f /path/to/zero.img'. It's inelegant, for sure, but it works (note to run it as a normal user or else be careful of how your system reacts to running out of disk space for a moment). fix-it-with-a-hammer-digimer On 08/02/16

Re: [CentOS-virt] KVM

> If you run top what are you seeing on the %Cpu(s) line? %20 On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr wrote: > Slow disks will show up as higher I/Owait times. > If your seeing 99% cpu usage then your likely looking at some other problem. > > If you run top what are you

Re: [CentOS-virt] KVM

You need to provide more information. 20% is what number. There are something like 6 numbers on that line. On 02/08/2016 02:56 PM, Gokan Atmaca wrote: If you run top what are you seeing on the %Cpu(s) line? %20 On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr wrote: Slow disks

Re: [CentOS-virt] KVM

On Mon, Feb 8, 2016 at 2:53 PM, Alvin Starr wrote: > You need to provide more information. > 20% is what number. > There are something like 6 numbers on that line. > > Post commands and results of command outputs ___ CentOS-virt

Re: [CentOS-virt] KVM

> Are the disk partitions properly aligned to 4k boundary on the host (and in > the guests too) ? > There are 5 in total server. 32G ram. 2T r1 (soft) disk. On Mon, Feb 8, 2016 at 9:41 PM, Zoltan Frombach wrote: > Are the disk partitions properly aligned to 4k boundary on

Re: [CentOS-virt] KVM

On 08/02/16 02:20 PM, Gokan Atmaca wrote: >> I'm guessing you're using standard 7,200rpm platter drives? You'll need >> to share more information about your environment in order for us to >> provide useful feedback. Usually though, the answer is 'caching' and/or >> 'faster disks'. > > Yes , 7.2k

Re: [CentOS-virt] KVM

Are the disk partitions properly aligned to 4k boundary on the host (and in the guests too) ? See http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.html and this: http://unix.stackexchange.com/questions/247387/check-if-partitions-are-aligned-properly-for-performance

Re: [CentOS-virt] KVM

On 08/02/16 02:12 PM, Gokan Atmaca wrote: > Hello > > I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very > increases. It consumes up to 99%. For this reason, slowing down the > other virtual machine. What should I do to solve the problem. ? > > Thanks.. I'm guessing you're using

Re: [CentOS-virt] KVM

> I'm guessing you're using standard 7,200rpm platter drives? You'll need > to share more information about your environment in order for us to > provide useful feedback. Usually though, the answer is 'caching' and/or > 'faster disks'. Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a

[CentOS-virt] KVM

Hello I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very increases. It consumes up to 99%. For this reason, slowing down the other virtual machine. What should I do to solve the problem. ? Thanks.. ___ CentOS-virt mailing list

Re: [CentOS-virt] KVM

Slow disks will show up as higher I/Owait times. If your seeing 99% cpu usage then your likely looking at some other problem. If you run top what are you seeing on the %Cpu(s) line? On 02/08/2016 02:20 PM, Gokan Atmaca wrote: I'm guessing you're using standard 7,200rpm platter drives? You'll

Re: [CentOS-virt] KVM

Using *top *and looki at *'wa' *value can tell you I/O wait time for each CPU Dont forget to press "*1*" to expand list of CPUs Tasks: 501 total, 4 running, 497 sleeping, 0 stopped, 0 zombie Cpu0 : 31.9%us, 52.7%sy, 0.0%ni, 15.1%id, *0.0%wa*, 0.0%hi, 0.3%si, 0.0%st Cpu1 : 29.7%us,

Re: [CentOS] Utility to zero unused blocks on disk

hdparm supports ATA secure erase. This is SSD safe, unlike other options. It's faster than writing zeros to both HDD and SSD. Chris Murphy On Mon, Feb 8, 2016, 3:06 PM wrote: > Wes James wrote: > > Is there a utility to zero unused blocks on a disk? > > > > CentOS 6.7/Ext4 >

Re: [CentOS] Utility to zero unused blocks on disk

DBAN is obsolete. NIST 800-88 for some time now says to use secure erase or enhanced security erase or crypto erase if supported. Other options do not erase data in remapped sectors. Chris Murphy ___ CentOS mailing list CentOS@centos.org

Re: [CentOS] Utility to zero unused blocks on disk

John R Pierce wrote: > On 2/8/2016 2:14 PM, Chris Murphy wrote: >> DBAN is obsolete. NIST 800-88 for some time now says to use secure erase >> or >> enhanced security erase or crypto erase if supported. >> >> Other options do not erase data in remapped sectors. > > the only truly safe way to

Re: [CentOS] Utility to zero unused blocks on disk

Wes James wrote: > Is there a utility to zero unused blocks on a disk? > > CentOS 6.7/Ext4 > > I saw zerofree, but I’m not sure it would work on Ext4 or even work on > this version of CentOS. > I don't understand the point of doing this. If you want to sanitize the disk, use dban , which surely

Re: [CentOS] Utility to zero unused blocks on disk

On 02/08/2016 03:05 PM, m.r...@5-cent.us wrote: Wes James wrote: Is there a utility to zero unused blocks on a disk? CentOS 6.7/Ext4 I saw zerofree, but I’m not sure it would work on Ext4 or even work on this version of CentOS. I don't understand the point of doing this. Wes didn't say

Re: [CentOS] Utility to zero unused blocks on disk

> On Feb 8, 2016, at 2:37 PM, Digimer wrote: > > Personally, I just do 'dd if=/dev/zero of=/path/to/zero.img bs=1M; rm -f > /path/to/zero.img'. It's inelegant, for sure, but it works (note to run > it as a normal user or else be careful of how your system reacts to > running

Re: [CentOS] Utility to zero unused blocks on disk

Chris Murphy wrote: > DBAN is obsolete. NIST 800-88 for some time now says to use secure erase > or enhanced security erase or crypto erase if supported. > > Other options do not erase data in remapped sectors. dban doesn't? What F/OSS does "secure erase"? And does it do what dban's DoD 5220.22-M

Re: [CentOS] Utility to zero unused blocks on disk

On 2/8/2016 2:14 PM, Chris Murphy wrote: DBAN is obsolete. NIST 800-88 for some time now says to use secure erase or enhanced security erase or crypto erase if supported. Other options do not erase data in remapped sectors. the only truly safe way to destroy data on magnetic media is to grind

Re: [CentOS] Utility to zero unused blocks on disk

On 2/8/2016 2:18 PM, m.r...@5-cent.us wrote: dban doesn't? What F/OSS does "secure erase"? And does it do what dban's DoD 5220.22-M does? do you even know what NISP Operating Manual 5220.22-M is? One thing it does NOT have is ANY specifications of methods of data erasure (it mentions data

Re: [CentOS] Utility to zero unused blocks on disk

On Mon, February 8, 2016 5:45 pm, John R Pierce wrote: > On 2/8/2016 3:33 PM, Valeri Galtsev wrote: >> DRAM had more persistent imprint of information that was sitting in it, >> which appears much harder to destroy than information on hard drive. > > well aware of that. 30 years ago a friend

Re: [CentOS] Utility to zero unused blocks on disk

On Mon, 2016-02-08 at 14:22 -0800, John R Pierce wrote: > the only truly safe way to destroy data on magnetic media is to grind > the media up into filings or melt it down in a furnace. I unscrew the casing, extract the disk platter(s), slide a very strong magnet over both sides of the platter

Re: [CentOS] Utility to zero unused blocks on disk

On 02/08/2016 06:38 PM, Always Learning wrote: > > On Mon, 2016-02-08 at 14:22 -0800, John R Pierce wrote: > >> the only truly safe way to destroy data on magnetic media is to grind >> the media up into filings or melt it down in a furnace. > > I unscrew the casing, extract the disk

Re: [CentOS] Utility to zero unused blocks on disk

On Mon, February 8, 2016 4:22 pm, John R Pierce wrote: > On 2/8/2016 2:14 PM, Chris Murphy wrote: >> DBAN is obsolete. NIST 800-88 for some time now says to use secure erase >> or >> enhanced security erase or crypto erase if supported. >> >> Other options do not erase data in remapped sectors. >

Re: [CentOS] Utility to zero unused blocks on disk

On Mon, February 8, 2016 3:37 pm, Digimer wrote: > Personally, I just do 'dd if=/dev/zero of=/path/to/zero.img bs=1M; rm -f > /path/to/zero.img'. It's inelegant, for sure, but it works (note to run > it as a normal user or else be careful of how your system reacts to > running out of disk space

Re: [CentOS] Utility to zero unused blocks on disk

On 2/8/2016 3:33 PM, Valeri Galtsev wrote: DRAM had more persistent imprint of information that was sitting in it, which appears much harder to destroy than information on hard drive. well aware of that. 30 years ago a friend and I built a specialized video card for a consulting project

Re: [CentOS] Utility to zero unused blocks on disk

Once upon a time, Greg Bailey said: > Wes didn't say the reason he wanted to zero unused blocks, but I > always do this in kickstart scripts when constructing VM images as > the image size is considerably reduced by doing this... For that purpose, use something that can TRIM a