ctdb_transaction: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/share/doc/ctdb/tests/bin/ctdb_transaction - from package: ctdb

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/lib/ctdb/tests/bin/ctdb_transaction - from package: ctdb-dbg

You may install the required package with command apt-get install {package}
Error in other languages:
ctdb_transaction: bevel nie gevind nie
ctdb_transaction: comandă negăsită
ctdb_transaction: comando não encontrado
ctdb_transaction: commande introuvable
ctdb_transaction: command not found
ctdb_transaction: käsku ei ole
ctdb_transaction: không tìm thấy lệnh
ctdb_transaction: komanda nerasta
ctdb_transaction: Kommando nicht gefunden.
ctdb_transaction: kommandot finns inte
ctdb_transaction: komut yok
ctdb_transaction: nie znaleziono polecenia
ctdb_transaction: níor aimsíodh an t-ordú
ctdb_transaction: no se encontró la orden
ctdb_transaction: no s'ha trobat l'ordre
ctdb_transaction: opdracht niet gevonden
ctdb_transaction: parancs nem található
ctdb_transaction: perintah tidak ditemukan
ctdb_transaction: príkaz nenájdený
ctdb_transaction: příkaz nenalezen
ctdb_transaction: команда не найдена
ctdb_transaction: командата не е открита
ctdb_transaction: 命令找不到
ctdb_transaction: コマンドが見つかりません