[lxc-users] lxc-users Digest, Vol 233, Issue 12
Thouraya TH
thouraya87 at gmail.com
Sun Jun 10 12:09:34 UTC 2018
Thank you so much for answer.
To clarify my question :
*If we start multiple containers that use the same image, the rootfs (or
any file inside the image) is only stored once. When the container is
started, a "writable layer" is created for each container, which will
contain filesystem changes that are made in each individual container. *
Is this is done with lxc or not ?
2018-06-10 13:00 GMT+01:00 <lxc-users-request at lists.linuxcontainers.org>:
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> Today's Topics:
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> 1. Re: lxc-users Digest, Vol 233, Issue 11 (Thouraya TH)
> 2. Re: lxc-users Digest, Vol 233, Issue 11 (Michel Jansens)
>
>
> ---------- Message transféré ----------
> From: Thouraya TH <thouraya87 at gmail.com>
> To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>,
> stgraber at ubuntu.com
> Cc:
> Bcc:
> Date: Sat, 9 Jun 2018 13:56:28 +0100
> Subject: Re: [lxc-users] lxc-users Digest, Vol 233, Issue 11
> Thank you for answer.
> Example
> lxc-create -n c1 -o ubuntu
> i don't mean ubuntu image
>
> I mean these files:
>
> Example:
>
> root at graphene-14:/var/lib/lxc/graphene-14-worker1# ls
>
> config fstab rootfs
>
>
> These folders content
> config fstab rootfs are the same for the three containers on the same
> host ?
> it's up to me to use a deduplication solution ? That's it ?
> Bests.
>
>
> 2018-06-09 13:00 GMT+01:00 <lxc-users-request at lists.linuxcontainers.org>:
>
>> Send lxc-users mailing list submissions to
>> lxc-users at lists.linuxcontainers.org
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> http://lists.linuxcontainers.org/listinfo/lxc-users
>> or, via email, send a message with subject or body 'help' to
>> lxc-users-request at lists.linuxcontainers.org
>>
>> You can reach the person managing the list at
>> lxc-users-owner at lists.linuxcontainers.org
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of lxc-users digest..."
>>
>> Today's Topics:
>>
>> 1. Re: Question : duplication (Stéphane Graber)
>> 2. Howto see actually used IPv6 (*not* link local) with lxc list
>> (v3.0.0)? (Oliver Rath)
>>
>>
>> ---------- Message transféré ----------
>> From: "Stéphane Graber" <stgraber at ubuntu.com>
>> To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>
>> Cc:
>> Bcc:
>> Date: Fri, 8 Jun 2018 11:30:07 -0400
>> Subject: Re: [lxc-users] Question : duplication
>> On Fri, Jun 08, 2018 at 12:13:34PM +0100, Thouraya TH wrote:
>> > Hi,
>> >
>> > In my cluster, i have 3 containers per host and i have 10 hosts.
>> > all containers are ubuntu containers.
>> > My question: the rootfs of these containers are the same ?
>> > i have duplicated files in different containers repository ?
>> >
>> >
>> >
>> > Thank you so much for answers.
>> > Best regards.
>>
>> Depends on your storage backend, all backends except the directory one
>> will use copy-on-write for deltas from the image used for the container
>> and their current state.
>>
>> If using ZFS and have quite a bit of spare RAM you can also turn on
>> deduplication on your ZPOOL which will then deduplicate writes as they
>> happen, possibly saving you a lot of disk space.
>>
>>
>> --
>> Stéphane Graber
>> Ubuntu developer
>> http://www.ubuntu.com
>>
>>
>> ---------- Message transféré ----------
>> From: Oliver Rath <rath at mglug.de>
>> To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>
>> Cc:
>> Bcc:
>> Date: Sat, 9 Jun 2018 13:47:16 +0200
>> Subject: [lxc-users] Howto see actually used IPv6 (*not* link local) with
>> lxc list (v3.0.0)?
>> Hi list,
>>
>> Im using IPv6 in several lxc environments. Is there a possibility to see
>> the actual set IPv6-Adresses (coming from radvd) in the list command?
>> Ive tried
>>
>> lxc list --columns="n",user.net.0.ipv6.address
>>
>> with no luck (field leaves empty), but
>>
>> # lxc list --columns="n",net.0.ipv6.address
>> Error: Invalid config key 'net.0.ipv6.address' in 'net.0.ipv6.address'
>>
>> gives an error. Unfortunatly I didnt found any hint whats the key name
>> for getting this information.
>>
>> What can I do?
>>
>> Tfh!
>>
>> Oliver
>>
>>
>>
>>
>> _______________________________________________
>> lxc-users mailing list
>> lxc-users at lists.linuxcontainers.org
>> http://lists.linuxcontainers.org/listinfo/lxc-users
>>
>
>
>
> ---------- Message transféré ----------
> From: Michel Jansens <michel.jansens at ulb.ac.be>
> To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>
> Cc:
> Bcc:
> Date: Sun, 10 Jun 2018 00:08:39 +0200
> Subject: Re: [lxc-users] lxc-users Digest, Vol 233, Issue 11
> Hi Oliver,
>
> I think I don’t completely understand what you mean, but I can say, if you
> use a ZFS storage, lxc init , or lxc copy your are creating ZFS clones
> (meaning sharing the data blocks, planned reduplication).
> If you want new blocks to be deduplicated, you must activate
> reduplication, but this will come at a cost: the system has to make a table
> of hashes, and for each write, check in that table if a block already has
> the same hash. It you don’t have enough memory, this happens on disk,
> meaning one write can generate many reads…
> You could also use extra data volumes and clone them through "zfs clone”
> instruction (for dev-test-prod environments).
>
> From all I’ve read, if you want to activate deduplication, you better have
> lots of RAM.
>
> Cheers,
>
> Michel
>
>
> On 9 Jun 2018, at 14:56, Thouraya TH <thouraya87 at gmail.com> wrote:
>
> Thank you for answer.
> Example
> lxc-create -n c1 -o ubuntu
> i don't mean ubuntu image
>
> I mean these files:
>
> Example:
>
> root at graphene-14:/var/lib/lxc/graphene-14-worker1# ls
>
> config fstab rootfs
>
>
> These folders content
> config fstab rootfs are the same for the three containers on the same
> host ?
> it's up to me to use a deduplication solution ? That's it ?
> Bests.
>
>
> 2018-06-09 13:00 GMT+01:00 <lxc-users-request at lists.linuxcontainers.org>:
>
>> Send lxc-users mailing list submissions to
>> lxc-users at lists.linuxcontainers.org
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> http://lists.linuxcontainers.org/listinfo/lxc-users
>> or, via email, send a message with subject or body 'help' to
>> lxc-users-request at lists.linuxcontainers.org
>>
>> You can reach the person managing the list at
>> lxc-users-owner at lists.linuxcontainers.org
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of lxc-users digest..."
>>
>> Today's Topics:
>>
>> 1. Re: Question : duplication (Stéphane Graber)
>> 2. Howto see actually used IPv6 (*not* link local) with lxc list
>> (v3.0.0)? (Oliver Rath)
>>
>>
>> ---------- Message transféré ----------
>> From: "Stéphane Graber" <stgraber at ubuntu.com>
>> To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>
>> Cc:
>> Bcc:
>> Date: Fri, 8 Jun 2018 11:30:07 -0400
>> Subject: Re: [lxc-users] Question : duplication
>> On Fri, Jun 08, 2018 at 12:13:34PM +0100, Thouraya TH wrote:
>> > Hi,
>> >
>> > In my cluster, i have 3 containers per host and i have 10 hosts.
>> > all containers are ubuntu containers.
>> > My question: the rootfs of these containers are the same ?
>> > i have duplicated files in different containers repository ?
>> >
>> >
>> >
>> > Thank you so much for answers.
>> > Best regards.
>>
>> Depends on your storage backend, all backends except the directory one
>> will use copy-on-write for deltas from the image used for the container
>> and their current state.
>>
>> If using ZFS and have quite a bit of spare RAM you can also turn on
>> deduplication on your ZPOOL which will then deduplicate writes as they
>> happen, possibly saving you a lot of disk space.
>>
>>
>> --
>> Stéphane Graber
>> Ubuntu developer
>> http://www.ubuntu.com
>>
>>
>> ---------- Message transféré ----------
>> From: Oliver Rath <rath at mglug.de>
>> To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>
>> Cc:
>> Bcc:
>> Date: Sat, 9 Jun 2018 13:47:16 +0200
>> Subject: [lxc-users] Howto see actually used IPv6 (*not* link local) with
>> lxc list (v3.0.0)?
>> Hi list,
>>
>> Im using IPv6 in several lxc environments. Is there a possibility to see
>> the actual set IPv6-Adresses (coming from radvd) in the list command?
>> Ive tried
>>
>> lxc list --columns="n",user.net.0.ipv6.address
>>
>> with no luck (field leaves empty), but
>>
>> # lxc list --columns="n",net.0.ipv6.address
>> Error: Invalid config key 'net.0.ipv6.address' in 'net.0.ipv6.address'
>>
>> gives an error. Unfortunatly I didnt found any hint whats the key name
>> for getting this information.
>>
>> What can I do?
>>
>> Tfh!
>>
>> Oliver
>>
>>
>>
>>
>> _______________________________________________
>> lxc-users mailing list
>> lxc-users at lists.linuxcontainers.org
>> http://lists.linuxcontainers.org/listinfo/lxc-users
>>
>
> _______________________________________________
> lxc-users mailing list
> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users
>
>
>
> _______________________________________________
> lxc-users mailing list
> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users
>
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