[DRBD-user] allow-two-primaries (hot migration) and three nodes...

[Stéphane Rivière]

So...

I've the answer. After many tries. The right syntax is...
With an equal sign between the parameter and the value :)

drbdadm net-options i1c1 --allow-two-primaries=no
drbdadm net-options i1c1 --allow-two-primaries=yes

But the command did not return an error message (viciously:)

I was alerted because I use this trick in my prompt¹ :

root at n202c1 🍀 ~ >drbdadm status
4-leaf clover=0

root at n202c1 🎱 ~ >drbdadm net-options i1c1 --allow-two-primaries no
8-billiard ball > 0

root at n201c1 🍀 ~ >drbdadm net-options i1c1 --allow-two-primaries=no
4-leaf clover=happy !

And... then... all went "logical"

root at n201c1 🍀 ~ >drbdadm status i1c1
i1c1 role:Secondary
  disk:UpToDate
  n202c1.genesix.org role:Primary
    peer-disk:UpToDate
  n250c1.genesix.org role:Secondary
    peer-disk:UpToDate

root at n201c1 🍀 ~ >drbdadm primary i1c1
i1c1: State change failed: (-1) Multiple primaries not allowed by config
Command 'drbdsetup primary i1c1' terminated with exit code 11
root at n201c1 🎱 ~ >drbdadm net-options i1c1 --allow-two-primaries=yes
root at n201c1 🍀 ~ >drbdadm primary i1c1
root at n201c1 🍀 ~ >

root at n201c1 🍀 ~ >drbdadm status i1c1
i1c1 role:Primary
  disk:UpToDate
  n202c1.genesix.org role:Primary
    peer-disk:UpToDate
  n250c1.genesix.org role:Secondary
    peer-disk:UpToDate


All the best from Oleron Island Thomas,

And thanks again to point me the "best practise" to put on
"allow-two-primaries" only if appropriate.

¹ This trick saved my day !!!


in .bashrc

emoji_err_code() {
    local errcode="$?"
    if [[ "$errcode" -eq 0 ]]
    then
        ErrSym=$(printf '\xF0\x9F\x8D\x80')
    else
        ErrSym=$(printf '\xF0\x9F\x8E\xB1')
    fi
    PS1=''${vecb}'\u'${blcb}'@'${vert}'\h '${ErrSym}' '${gris}'\w
'${blcb}''${c_of}'${STY}>'
}
export PROMPT_COMMAND=emoji_err_code

-- 
Stéphane Rivière
Ile d'Oléron - France