crm_master: command not found

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

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

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/sbin/crm_master - from package: pacemaker

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

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