How to put logout image in all page header

Ionic Framework ionic-v3
1

i want to display logout/add person image on all page .
currently i am using below code

<ion-header>
  <ion-toolbar>
  <ion-buttons start>
    <button royal>
      <ion-icon name="search"></ion-icon>
    </button>
  </ion-buttons>
  <ion-title>Welcome</ion-title>
  <ion-buttons end>
    <button royal>
      <ion-icon name="person-add"></ion-icon>
    </button>
  </ion-buttons>
</ion-toolbar>
</ion-header>
<ion-content padding>
<form>
<ion-list>
  <ion-item *ngFor="let item of pages" (click)="itemSelected(item.title)">
    <ion-avatar item-left>
      <img src="{{item.image}}">
    </ion-avatar>
    <h2>{{item.title}}</h2>
  </ion-item>
</ion-list>
</form>
</ion-content>

but using above code i set only one page but i want in all page .