hyperv centos guest consumes all memory
I enabled in hyper-v 2012 the use of dynamic memory for a centos vm
centos-release-6-9.el6.12.
I followed these guidelines https://www.altaro.com/hyper-v/centos-linux-hyper-v/
I created a file in /etc/udev/rules.d/ named 100-balloon.rules
content:
I setup startup mem 1024, minimal memory 1024 and max 4096
unlike other centos vm's I have it starts consuming all memory
so, i gave it 8Gb .. all memory was consumed
I increased the max memory to 20Gb, and it was consumed
this is meminfo
centos-release-6-9.el6.12.
I followed these guidelines https://www.altaro.com/hyper-v/centos-linux-hyper-v/
I created a file in /etc/udev/rules.d/ named 100-balloon.rules
content:
SUBSYSTEM=="memory", ACTION=="add", ATTR{state}="online"
I setup startup mem 1024, minimal memory 1024 and max 4096
unlike other centos vm's I have it starts consuming all memory
so, i gave it 8Gb .. all memory was consumed
I increased the max memory to 20Gb, and it was consumed
this is meminfo
cat /proc/meminfo
MemTotal: 1012124 kB
MemFree: 103732 kB
Buffers: 57512 kB
Cached: 270100 kB
SwapCached: 0 kB
Active: 532960 kB
Inactive: 194180 kB
Active(anon): 399540 kB
Inactive(anon): 33240 kB
Active(file): 133420 kB
Inactive(file): 160940 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 2031612 kB
SwapFree: 2031612 kB
Dirty: 124 kB
Writeback: 0 kB
AnonPages: 399552 kB
Mapped: 61676 kB
Shmem: 33252 kB
Slab: 66568 kB
SReclaimable: 33048 kB
SUnreclaim: 33520 kB
KernelStack: 7104 kB
PageTables: 13568 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 2537672 kB
Committed_AS: 1654524 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 31292 kB
VmallocChunk: 34359591288 kB
HardwareCorrupted: 0 kB
AnonHugePages: 77824 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 8128 kB
DirectMap2M: 4317184 kB
top - 17:28:04 up 11 min, 1 user, load average: 0.57, 0.40, 0.26
Tasks: 349 total, 1 running, 348 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.4%us, 0.7%sy, 2.9%ni, 95.5%id, 0.5%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1012124k total, 912916k used, 99208k free, 58476k buffers
Swap: 2031612k total, 0k used, 2031612k free, 266864k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2305 apache 20 0 281m 98m 40m S 0.0 9.9 0:18.13 httpd
2184 mysql 20 0 1114m 94m 6264 S 0.0 9.6 0:44.22 mysqld
2302 apache 20 0 258m 87m 38m S 0.0 8.9 0:11.07 httpd
2295 apache 20 0 561m 73m 37m S 0.0 7.5 0:09.10 httpd
2298 apache 20 0 239m 63m 32m S 0.0 6.4 0:09.53 httpd
2362 apache 20 0 312m 39m 29m S 0.0 4.0 0:10.26 httpd
2456 apache 20 0 312m 37m 27m S 0.0 3.8 0:08.34 httpd
2893 named 20 0 991m 32m 3056 S 0.0 3.3 0:00.50 named
2457 apache 20 0 312m 32m 22m S 0.0 3.3 0:09.53 httpd
2296 apache 20 0 217m 29m 19m S 0.0 2.9 0:15.26 httpd
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ASKER
thanks for your reply
yes.. finding out what's the difference
but I have some 6 other vm's all centos, same setup, and they behave :)
yes.. finding out what's the difference
but I have some 6 other vm's all centos, same setup, and they behave :)
Ah, now I see. Are the other VMs that are behaving also set up with dynamic memory?
Are Integration Services installed and updated?
Are Integration Services installed and updated?
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Thanks David.. always good to learn something new.
I found this link
https://www.experts-exchange.com/questions/28511155/Hyper-V-virtual-machine-RAM-performance-shows-95-used-but-I-can't-find-where.html
So you're right.. Linux is fine, managing it's mem inside the box. Only the HV-host thinks the VM neeeds a lot of mem.
I limited it to 4Gb.. like in the picture I posted and the VM runs fine.
Still the question why HV-host thinks the guest needs and uses more RAM
I found this link
https://www.experts-exchange.com/questions/28511155/Hyper-V-virtual-machine-RAM-performance-shows-95-used-but-I-can't-find-where.html
So you're right.. Linux is fine, managing it's mem inside the box. Only the HV-host thinks the VM neeeds a lot of mem.
I limited it to 4Gb.. like in the picture I posted and the VM runs fine.
Still the question why HV-host thinks the guest needs and uses more RAM
My suspicion is that the Distro is a bit behind on installing the newest Integration Services for *NIX.
Is there a revision difference between the "misbehaving" VM and the others? Perhaps running a version check against their IS versus this VM's IS to see would help.
Is there a revision difference between the "misbehaving" VM and the others? Perhaps running a version check against their IS versus this VM's IS to see would help.
Tip: For starting new projects, use Ubuntu Bionic which has a much newer Kernel (by years) than the CentOS 6.X Distro.
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The bottom list shows very little memory being actually consumed if I'm reading that right. So, the next place to look is behind the scenes. What daemons are setting up a cache of some sort to use for their purposes. Is there a way to see the numbers for all memory a daemon uses?
I suggest installing the vanilla OS with no roles/features enabled at all. I suspect that memory usage would remain as expected that being very minimal.