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How Linux servers update their kernel without rebooting
2019 Community Moderator ElectionChain loading kernel without a boot loaderHow to repair system if kernel panic?expanding the priorities table in runqueue in Linux kernel“Last resort” Linux terminal command to reboot (over ssh) in case of a kernel bug?Installing linux kernel 4.4.0-trunk-amd64 crashes X serverRunning a current Linux OS on older kernel (what are the / are there disadvantages?)Can't run any snap using linux 4.12 : snap-confine has elevated permissions and is not confined but should beArch Linux kernel version not changing even after upgradeWhy does apt autoremove not remove all old kernel packages at once?Is /var/run/reboot-required a reliable indicator of a needed reboot?
According to my informations, upgrading the linux kernel needs a reboot. Rebooting a home computer is not a problem, but I don't think that it is the same thing for a server.
So does the servers that use Linux distributions reboot after upgrading the kernel, or do they use some kind of a trick to avoid booting ??
linux-kernel upgrade
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
add a comment |
According to my informations, upgrading the linux kernel needs a reboot. Rebooting a home computer is not a problem, but I don't think that it is the same thing for a server.
So does the servers that use Linux distributions reboot after upgrading the kernel, or do they use some kind of a trick to avoid booting ??
linux-kernel upgrade
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
add a comment |
According to my informations, upgrading the linux kernel needs a reboot. Rebooting a home computer is not a problem, but I don't think that it is the same thing for a server.
So does the servers that use Linux distributions reboot after upgrading the kernel, or do they use some kind of a trick to avoid booting ??
linux-kernel upgrade
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
According to my informations, upgrading the linux kernel needs a reboot. Rebooting a home computer is not a problem, but I don't think that it is the same thing for a server.
So does the servers that use Linux distributions reboot after upgrading the kernel, or do they use some kind of a trick to avoid booting ??
linux-kernel upgrade
linux-kernel upgrade
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
asked Feb 16 '17 at 20:07
SidahmedSidahmed
7931418
7931418
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
A kernel change should get a reboot. You can install the kernel, and in some cases you can insert and remove modules of different kernels, but I would not advise it.
A server could be rebooted and service would be unaffected if the server is part of a cluster. You can create firewall/router clusters too, such that there is no central point of failure (SPOF). To do this you use what is called a Virtual IP (VIP) that is shared across more than one system.
If you want to experiment with this idea you can use QEMU or VirtualBox and others to create virtual networks.
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
5
What about live kernel patching?
– jiggunjer
Feb 16 '17 at 20:25
The question was not specific to minor patching but mentions 'upgrade' which I will take to mean major version upgrades. Therefore, to 'upgrade' from 2.6 -> 3.0 I would recommend dropping the machine from load before starting upgrade work. Post kernel changes I would reboot. Since grub/lilo is likely to need changes I would suggest a courtesy reboot anyway.
– Ed Neville
Feb 17 '17 at 14:36
add a comment |
Yes, they do a "reboot", but could do a kexec_load system call to preload the new kernel.
There is the possibility of patching the running kernel as well, redhat kpatch for example. All the things which do this that I am aware of can not change the data structures.
Of course lisp machines used to be able to patch their running kernels in the last century.
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
1
There's also vanillakexec, for just booting the new kernel immediately. Depending on your definition of "reboot", this might qualify as a non-reboot kernel upgrade.
– Patrick
Feb 17 '17 at 2:26
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
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active
oldest
votes
A kernel change should get a reboot. You can install the kernel, and in some cases you can insert and remove modules of different kernels, but I would not advise it.
A server could be rebooted and service would be unaffected if the server is part of a cluster. You can create firewall/router clusters too, such that there is no central point of failure (SPOF). To do this you use what is called a Virtual IP (VIP) that is shared across more than one system.
If you want to experiment with this idea you can use QEMU or VirtualBox and others to create virtual networks.
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
5
What about live kernel patching?
– jiggunjer
Feb 16 '17 at 20:25
The question was not specific to minor patching but mentions 'upgrade' which I will take to mean major version upgrades. Therefore, to 'upgrade' from 2.6 -> 3.0 I would recommend dropping the machine from load before starting upgrade work. Post kernel changes I would reboot. Since grub/lilo is likely to need changes I would suggest a courtesy reboot anyway.
– Ed Neville
Feb 17 '17 at 14:36
add a comment |
A kernel change should get a reboot. You can install the kernel, and in some cases you can insert and remove modules of different kernels, but I would not advise it.
A server could be rebooted and service would be unaffected if the server is part of a cluster. You can create firewall/router clusters too, such that there is no central point of failure (SPOF). To do this you use what is called a Virtual IP (VIP) that is shared across more than one system.
If you want to experiment with this idea you can use QEMU or VirtualBox and others to create virtual networks.
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
5
What about live kernel patching?
– jiggunjer
Feb 16 '17 at 20:25
The question was not specific to minor patching but mentions 'upgrade' which I will take to mean major version upgrades. Therefore, to 'upgrade' from 2.6 -> 3.0 I would recommend dropping the machine from load before starting upgrade work. Post kernel changes I would reboot. Since grub/lilo is likely to need changes I would suggest a courtesy reboot anyway.
– Ed Neville
Feb 17 '17 at 14:36
add a comment |
A kernel change should get a reboot. You can install the kernel, and in some cases you can insert and remove modules of different kernels, but I would not advise it.
A server could be rebooted and service would be unaffected if the server is part of a cluster. You can create firewall/router clusters too, such that there is no central point of failure (SPOF). To do this you use what is called a Virtual IP (VIP) that is shared across more than one system.
If you want to experiment with this idea you can use QEMU or VirtualBox and others to create virtual networks.
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
A kernel change should get a reboot. You can install the kernel, and in some cases you can insert and remove modules of different kernels, but I would not advise it.
A server could be rebooted and service would be unaffected if the server is part of a cluster. You can create firewall/router clusters too, such that there is no central point of failure (SPOF). To do this you use what is called a Virtual IP (VIP) that is shared across more than one system.
If you want to experiment with this idea you can use QEMU or VirtualBox and others to create virtual networks.
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
answered Feb 16 '17 at 20:19
Ed NevilleEd Neville
1,13758
1,13758
5
What about live kernel patching?
– jiggunjer
Feb 16 '17 at 20:25
The question was not specific to minor patching but mentions 'upgrade' which I will take to mean major version upgrades. Therefore, to 'upgrade' from 2.6 -> 3.0 I would recommend dropping the machine from load before starting upgrade work. Post kernel changes I would reboot. Since grub/lilo is likely to need changes I would suggest a courtesy reboot anyway.
– Ed Neville
Feb 17 '17 at 14:36
add a comment |
5
What about live kernel patching?
– jiggunjer
Feb 16 '17 at 20:25
The question was not specific to minor patching but mentions 'upgrade' which I will take to mean major version upgrades. Therefore, to 'upgrade' from 2.6 -> 3.0 I would recommend dropping the machine from load before starting upgrade work. Post kernel changes I would reboot. Since grub/lilo is likely to need changes I would suggest a courtesy reboot anyway.
– Ed Neville
Feb 17 '17 at 14:36
5
5
What about live kernel patching?
– jiggunjer
Feb 16 '17 at 20:25
What about live kernel patching?
– jiggunjer
Feb 16 '17 at 20:25
The question was not specific to minor patching but mentions 'upgrade' which I will take to mean major version upgrades. Therefore, to 'upgrade' from 2.6 -> 3.0 I would recommend dropping the machine from load before starting upgrade work. Post kernel changes I would reboot. Since grub/lilo is likely to need changes I would suggest a courtesy reboot anyway.
– Ed Neville
Feb 17 '17 at 14:36
The question was not specific to minor patching but mentions 'upgrade' which I will take to mean major version upgrades. Therefore, to 'upgrade' from 2.6 -> 3.0 I would recommend dropping the machine from load before starting upgrade work. Post kernel changes I would reboot. Since grub/lilo is likely to need changes I would suggest a courtesy reboot anyway.
– Ed Neville
Feb 17 '17 at 14:36
add a comment |
Yes, they do a "reboot", but could do a kexec_load system call to preload the new kernel.
There is the possibility of patching the running kernel as well, redhat kpatch for example. All the things which do this that I am aware of can not change the data structures.
Of course lisp machines used to be able to patch their running kernels in the last century.
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
1
There's also vanillakexec, for just booting the new kernel immediately. Depending on your definition of "reboot", this might qualify as a non-reboot kernel upgrade.
– Patrick
Feb 17 '17 at 2:26
add a comment |
Yes, they do a "reboot", but could do a kexec_load system call to preload the new kernel.
There is the possibility of patching the running kernel as well, redhat kpatch for example. All the things which do this that I am aware of can not change the data structures.
Of course lisp machines used to be able to patch their running kernels in the last century.
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
1
There's also vanillakexec, for just booting the new kernel immediately. Depending on your definition of "reboot", this might qualify as a non-reboot kernel upgrade.
– Patrick
Feb 17 '17 at 2:26
add a comment |
Yes, they do a "reboot", but could do a kexec_load system call to preload the new kernel.
There is the possibility of patching the running kernel as well, redhat kpatch for example. All the things which do this that I am aware of can not change the data structures.
Of course lisp machines used to be able to patch their running kernels in the last century.
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
Yes, they do a "reboot", but could do a kexec_load system call to preload the new kernel.
There is the possibility of patching the running kernel as well, redhat kpatch for example. All the things which do this that I am aware of can not change the data structures.
Of course lisp machines used to be able to patch their running kernels in the last century.
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
answered Feb 16 '17 at 20:26
icarusicarus
6,12111231
6,12111231
1
There's also vanillakexec, for just booting the new kernel immediately. Depending on your definition of "reboot", this might qualify as a non-reboot kernel upgrade.
– Patrick
Feb 17 '17 at 2:26
add a comment |
1
There's also vanillakexec, for just booting the new kernel immediately. Depending on your definition of "reboot", this might qualify as a non-reboot kernel upgrade.
– Patrick
Feb 17 '17 at 2:26
1
1
There's also vanilla
kexec, for just booting the new kernel immediately. Depending on your definition of "reboot", this might qualify as a non-reboot kernel upgrade.– Patrick
Feb 17 '17 at 2:26
There's also vanilla
kexec, for just booting the new kernel immediately. Depending on your definition of "reboot", this might qualify as a non-reboot kernel upgrade.– Patrick
Feb 17 '17 at 2:26
add a comment |
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