crmadmin: 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/crmadmin - from package: pacemaker-cli

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

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