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Load spikes during rpm -qa kernelcare

Camilo Herrera
Hi Guys, Does anybody knows what the following command does, and why it may be causing load spikes?: rpm -qa --queryformat~{RELEASE}\n kernelcare
The server does not have a kernelcare license by the way. Thanks!

Comments

6 comments

Date Votes
  • cPanelLauren
    Hello @Camilo Herrera Where did you copy this from? This is just querying for the kernelcare rpm on the system - if you don't have kernelcare (or even kernelcare symlink protection) it shouldn't be running. What is the output of the following: rpm -qa kernelcare kernelcare-2.16-1.x86_64
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  • Camilo Herrera
    Hello @Camilo Herrera Where did you copy this from? This is just querying for the kernelcare rpm on the system - if you don't have kernelcare (or even kernelcare symlink protection) it shouldn't be running. What is the output of the following: rpm -qa kernelcare kernelcare-2.16-1.x86_64

    Hello Lauren, The output is empty. During the load spike we ran iotop -oa
    and it was there at 99% on the IO colum, we have seen this behavior somewhat common after cPanel updates.
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  • cPanelLauren
    Hi @Camilo Herrera That's IOwait you're looking at - the amount of time a read/write takes on the disk if there's a lot of activity it's going to take a bit longer. Some IO wait is normal during an update or resource intensive activities. If you're not running KernelCare though it seems that at some point the system is looking for it most likely to determine its installation status. I'm curious now what your IO wait is all the time, are you on a VPS or a hardware server? What's the output of the following: sar -p
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  • Camilo Herrera
    Hi @Camilo Herrera That's IOwait you're looking at - the amount of time a read/write takes on the disk if there's a lot of activity it's going to take a bit longer. Some IO wait is normal during an update or resource intensive activities. If you're not running KernelCare though it seems that at some point the system is looking for it most likely to determine its installation status. I'm curious now what your IO wait is all the time, are you on a VPS or a hardware server? What's the output of the following: sar -p

    It is a hardware server, this is the command output: Linux 3.10.0-329.7.2.lve1.4.2.el7.x86_64 (xxx) 03/01/2019 _x86_64_ (8 CPU) 12:00:01 AM CPU %user %nice %system %iowait %steal %idle 12:10:01 AM all 10.41 0.11 1.38 3.04 0.00 85.06 12:20:01 AM all 4.43 0.10 0.74 1.76 0.00 92.97 12:30:01 AM all 9.00 0.11 1.18 8.23 0.00 81.48 12:40:01 AM all 7.62 0.12 1.16 5.80 0.00 85.31 12:50:01 AM all 7.54 0.10 1.06 2.32 0.00 88.98 01:00:01 AM all 8.40 0.12 1.04 1.94 0.00 88.50 01:10:01 AM all 7.23 0.43 1.45 11.10 0.00 79.79 01:20:01 AM all 9.18 0.45 1.87 14.63 0.00 73.86 01:30:02 AM all 11.52 0.38 2.26 20.74 0.00 65.11 01:40:01 AM all 7.28 0.37 2.00 16.75 0.00 73.60 01:50:02 AM all 10.63 0.38 2.14 22.88 0.00 63.96 02:00:02 AM all 8.57 0.40 1.80 16.24 0.00 73.00 02:10:03 AM all 7.47 0.51 2.26 15.31 0.00 74.45 02:20:01 AM all 8.28 0.38 1.82 17.46 0.00 72.05 02:30:02 AM all 10.17 0.48 1.68 15.34 0.00 72.34 02:40:02 AM all 8.64 0.41 1.77 19.11 0.00 70.08 02:50:02 AM all 13.01 0.44 2.36 14.90 0.00 69.29 03:00:02 AM all 14.96 0.45 2.34 16.99 0.00 65.26 03:10:01 AM all 7.28 0.47 1.94 13.54 0.00 76.77 03:20:01 AM all 3.93 0.49 1.42 15.52 0.00 78.64 03:30:02 AM all 7.26 0.37 1.75 20.61 0.00 70.01 03:40:01 AM all 10.99 0.16 1.48 12.66 0.00 74.72 03:50:01 AM all 4.68 0.10 0.77 3.84 0.00 90.61 04:00:01 AM all 7.03 0.16 1.04 5.66 0.00 86.11 04:10:01 AM all 5.43 0.10 0.87 3.79 0.00 89.81 04:20:01 AM all 4.89 0.11 0.82 2.30 0.00 91.87 04:30:01 AM all 6.21 0.11 0.93 2.90 0.00 89.85 04:40:01 AM all 17.03 0.10 1.15 4.64 0.00 77.08 04:50:01 AM all 7.05 0.10 0.90 1.87 0.00 90.08 05:00:01 AM all 7.32 0.10 1.00 1.91 0.00 89.68 05:00:01 AM CPU %user %nice %system %iowait %steal %idle 05:10:01 AM all 6.76 0.11 1.41 33.30 0.00 58.42 05:20:01 AM all 5.30 0.10 1.42 19.13 0.00 74.04 05:30:01 AM all 9.00 0.10 1.71 17.17 0.00 72.01 05:40:01 AM all 5.89 0.12 0.85 4.45 0.00 88.69 05:50:02 AM all 3.97 0.10 0.74 1.75 0.00 93.44 06:00:02 AM all 4.02 0.12 0.82 2.97 0.00 92.08 06:10:01 AM all 5.72 0.13 0.93 4.20 0.00 89.03 06:20:02 AM all 6.77 0.14 1.06 4.98 0.00 87.05 06:30:01 AM all 8.46 0.10 1.33 2.39 0.00 87.72 06:40:01 AM all 10.79 0.11 1.52 3.59 0.00 83.99 06:50:01 AM all 12.62 0.10 1.85 2.20 0.00 83.23 07:00:01 AM all 9.45 0.10 1.33 2.89 0.00 86.23 07:10:01 AM all 7.81 0.10 1.18 4.24 0.00 86.68 07:20:01 AM all 8.00 1.79 1.68 7.36 0.00 81.17 07:30:01 AM all 14.63 1.74 2.24 10.34 0.00 71.05 07:40:01 AM all 7.87 0.78 1.37 9.40 0.00 80.58 07:50:01 AM all 14.20 0.13 2.05 5.00 0.00 78.63 08:00:01 AM all 11.40 0.11 1.63 4.59 0.00 82.27 08:10:01 AM all 9.92 0.10 1.51 6.57 0.00 81.90 08:20:01 AM all 8.49 0.10 1.28 4.16 0.00 85.97 08:30:01 AM all 7.60 0.10 1.25 5.36 0.00 85.69 08:40:01 AM all 8.44 0.10 1.48 7.62 0.00 82.35 08:50:01 AM all 8.02 0.10 1.41 7.88 0.00 82.59 09:00:01 AM all 6.77 0.11 1.31 6.49 0.00 85.33 09:10:01 AM all 5.86 0.10 1.21 5.66 0.00 87.17 09:20:01 AM all 8.79 0.11 1.53 6.79 0.00 82.79 09:30:01 AM all 12.40 0.11 1.89 9.29 0.00 76.30 09:40:01 AM all 11.63 0.11 1.75 8.60 0.00 77.91 09:50:02 AM all 13.58 0.12 2.04 7.05 0.00 77.21 10:00:01 AM all 12.13 0.11 1.93 6.72 0.00 79.11 10:00:01 AM CPU %user %nice %system %iowait %steal %idle 10:10:01 AM all 10.50 0.10 1.71 6.48 0.00 81.21 10:20:01 AM all 15.76 0.11 2.24 7.07 0.00 74.82 10:30:01 AM all 18.27 0.11 2.35 12.58 0.00 66.68 10:40:01 AM all 11.22 0.11 1.82 10.41 0.00 76.44 10:50:01 AM all 14.69 0.11 2.20 8.83 0.00 74.17 11:00:01 AM all 11.66 0.11 2.01 7.89 0.00 78.33 11:10:01 AM all 8.31 0.11 1.52 7.08 0.00 82.98 11:20:01 AM all 9.19 0.11 1.69 7.62 0.00 81.39 11:30:02 AM all 9.62 0.11 1.69 8.35 0.00 80.23 11:40:02 AM all 13.86 0.10 2.13 12.56 0.00 71.35 11:50:01 AM all 10.30 0.11 1.88 8.49 0.00 79.22 Average: all 9.20 0.23 1.54 8.92 0.00 80.11
    Maybe it is something else causing the load and the high iowait, guess we are going to need some further investigation.
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  • cPanelLauren
    Hi @Camilo Herrera
    Maybe it is something else causing the load and the high iowait, guess we are going to need some further investigation.

    After seeing that I do agree, that's some pretty high IO wait on the server during those time frames.
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  • Camilo Herrera
    Hi @Camilo Herrera After seeing that I do agree, that's some pretty high IO wait on the server during those time frames.

    I will be monitoring the server to find the source, Thanks!
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